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Finding the Fourth Proportional to 78,385.52, 108,172 and 42,575.60

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Solution

The fourth proportional to 78,385.52, 108,172 and 42,575.60 is: 58,754.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,385.52 : 108,172 = 42,575.60 : x
  2. Step 2: Convert to fraction form
    78,385.52/108,172 = 42,575.60/x
  3. Step 3: Cross multiply
    78,385.52x = 108,172 × 42,575.60
  4. Step 4: Simplify right side
    78,385.52x = 4,605,487,803.20
  5. Step 5: Solve for x
    x = 4,605,487,803.20/78,385.52
  6. Step 6: Final answer
    x = 58,754.32

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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.