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Finding the Fourth Proportional to 543,399.18, 749,685.15 and 400,500.78

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Solution

The fourth proportional to 543,399.18, 749,685.15 and 400,500.78 is: 552,539.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,399.18 : 749,685.15 = 400,500.78 : x
  2. Step 2: Convert to fraction form
    543,399.18/749,685.15 = 400,500.78/x
  3. Step 3: Cross multiply
    543,399.18x = 749,685.15 × 400,500.78
  4. Step 4: Simplify right side
    543,399.18x = 300,249,487,329.42
  5. Step 5: Solve for x
    x = 300,249,487,329.42/543,399.18
  6. Step 6: Final answer
    x = 552,539.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.