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Finding the Fourth Proportional to 638,139.10, 957,208.65 and 559,407.10

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Solution

The fourth proportional to 638,139.10, 957,208.65 and 559,407.10 is: 839,110.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139.10 : 957,208.65 = 559,407.10 : x
  2. Step 2: Convert to fraction form
    638,139.10/957,208.65 = 559,407.10/x
  3. Step 3: Cross multiply
    638,139.10x = 957,208.65 × 559,407.10
  4. Step 4: Simplify right side
    638,139.10x = 535,469,314,991.42
  5. Step 5: Solve for x
    x = 535,469,314,991.42/638,139.10
  6. Step 6: Final answer
    x = 839,110.65

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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.