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Finding the Fourth Proportional to 138,877.73, 191,663.07 and 78,459.46

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Solution

The fourth proportional to 138,877.73, 191,663.07 and 78,459.46 is: 108,280.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,877.73 : 191,663.07 = 78,459.46 : x
  2. Step 2: Convert to fraction form
    138,877.73/191,663.07 = 78,459.46/x
  3. Step 3: Cross multiply
    138,877.73x = 191,663.07 × 78,459.46
  4. Step 4: Simplify right side
    138,877.73x = 15,037,780,974.14
  5. Step 5: Solve for x
    x = 15,037,780,974.14/138,877.73
  6. Step 6: Final answer
    x = 108,280.72

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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.