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Finding the Fourth Proportional to 1,292,789.28, 1,939,183.92 and 406,325.28

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Solution

The fourth proportional to 1,292,789.28, 1,939,183.92 and 406,325.28 is: 609,487.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292,789.28 : 1,939,183.92 = 406,325.28 : x
  2. Step 2: Convert to fraction form
    1,292,789.28/1,939,183.92 = 406,325.28/x
  3. Step 3: Cross multiply
    1,292,789.28x = 1,939,183.92 × 406,325.28
  4. Step 4: Simplify right side
    1,292,789.28x = 787,939,449,265.50
  5. Step 5: Solve for x
    x = 787,939,449,265.50/1,292,789.28
  6. Step 6: Final answer
    x = 609,487.92

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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.