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Finding the Fourth Proportional to 1,287,318,734.20, 1,930,978,101.30 and 425,675,726.20

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Solution

The fourth proportional to 1,287,318,734.20, 1,930,978,101.30 and 425,675,726.20 is: 638,513,589.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,318,734.20 : 1,930,978,101.30 = 425,675,726.20 : x
  2. Step 2: Convert to fraction form
    1,287,318,734.20/1,930,978,101.30 = 425,675,726.20/x
  3. Step 3: Cross multiply
    1,287,318,734.20x = 1,930,978,101.30 × 425,675,726.20
  4. Step 4: Simplify right side
    1,287,318,734.20x = 821,970,505,547,174,656
  5. Step 5: Solve for x
    x = 821,970,505,547,174,656/1,287,318,734.20
  6. Step 6: Final answer
    x = 638,513,589.30

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Double scale
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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.