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Finding the Fourth Proportional to 78,344.60, 108,115.62 and 42,534.60

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Solution

The fourth proportional to 78,344.60, 108,115.62 and 42,534.60 is: 58,697.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,344.60 : 108,115.62 = 42,534.60 : x
  2. Step 2: Convert to fraction form
    78,344.60/108,115.62 = 42,534.60/x
  3. Step 3: Cross multiply
    78,344.60x = 108,115.62 × 42,534.60
  4. Step 4: Simplify right side
    78,344.60x = 4,598,654,650.45
  5. Step 5: Solve for x
    x = 4,598,654,650.45/78,344.60
  6. Step 6: Final answer
    x = 58,697.79

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1.5x scale

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.