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Finding the Fourth Proportional to 40,978.80, 61,468.20 and 28,512.90

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Solution

The fourth proportional to 40,978.80, 61,468.20 and 28,512.90 is: 42,769.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,978.80 : 61,468.20 = 28,512.90 : x
  2. Step 2: Convert to fraction form
    40,978.80/61,468.20 = 28,512.90/x
  3. Step 3: Cross multiply
    40,978.80x = 61,468.20 × 28,512.90
  4. Step 4: Simplify right side
    40,978.80x = 1,752,636,639.78
  5. Step 5: Solve for x
    x = 1,752,636,639.78/40,978.80
  6. Step 6: Final answer
    x = 42,769.35

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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.