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Finding the Fourth Proportional to 638,403.40, 957,605.10 and 259,323.40

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Solution

The fourth proportional to 638,403.40, 957,605.10 and 259,323.40 is: 388,985.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,403.40 : 957,605.10 = 259,323.40 : x
  2. Step 2: Convert to fraction form
    638,403.40/957,605.10 = 259,323.40/x
  3. Step 3: Cross multiply
    638,403.40x = 957,605.10 × 259,323.40
  4. Step 4: Simplify right side
    638,403.40x = 248,329,410,389.34
  5. Step 5: Solve for x
    x = 248,329,410,389.34/638,403.40
  6. Step 6: Final answer
    x = 388,985.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.