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Finding the Fourth Proportional to 539,487.40, 809,231.10 and 258,860.20

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Solution

The fourth proportional to 539,487.40, 809,231.10 and 258,860.20 is: 388,290.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,487.40 : 809,231.10 = 258,860.20 : x
  2. Step 2: Convert to fraction form
    539,487.40/809,231.10 = 258,860.20/x
  3. Step 3: Cross multiply
    539,487.40x = 809,231.10 × 258,860.20
  4. Step 4: Simplify right side
    539,487.40x = 209,477,724,392.22
  5. Step 5: Solve for x
    x = 209,477,724,392.22/539,487.40
  6. Step 6: Final answer
    x = 388,290.30

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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.