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Finding the Fourth Proportional to 657,978.20, 985,655.10 and 342,612.80

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Solution

The fourth proportional to 657,978.20, 985,655.10 and 342,612.80 is: 513,235.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,978.20 : 985,655.10 = 342,612.80 : x
  2. Step 2: Convert to fraction form
    657,978.20/985,655.10 = 342,612.80/x
  3. Step 3: Cross multiply
    657,978.20x = 985,655.10 × 342,612.80
  4. Step 4: Simplify right side
    657,978.20x = 337,698,053,645.28
  5. Step 5: Solve for x
    x = 337,698,053,645.28/657,978.20
  6. Step 6: Final answer
    x = 513,235.93

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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.