Home / 138,861.52-191,627.40-78,432.28

Finding the Fourth Proportional to 138,861.52, 191,627.40 and 78,432.28

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Solution

The fourth proportional to 138,861.52, 191,627.40 and 78,432.28 is: 108,235.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,861.52 : 191,627.40 = 78,432.28 : x
  2. Step 2: Convert to fraction form
    138,861.52/191,627.40 = 78,432.28/x
  3. Step 3: Cross multiply
    138,861.52x = 191,627.40 × 78,432.28
  4. Step 4: Simplify right side
    138,861.52x = 15,029,773,892.47
  5. Step 5: Solve for x
    x = 15,029,773,892.47/138,861.52
  6. Step 6: Final answer
    x = 108,235.70

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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.