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Finding the Fourth Proportional to 138,790.59, 191,523.65 and 81,421.98

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Solution

The fourth proportional to 138,790.59, 191,523.65 and 81,421.98 is: 112,358.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,790.59 : 191,523.65 = 81,421.98 : x
  2. Step 2: Convert to fraction form
    138,790.59/191,523.65 = 81,421.98/x
  3. Step 3: Cross multiply
    138,790.59x = 191,523.65 × 81,421.98
  4. Step 4: Simplify right side
    138,790.59x = 15,594,234,799.83
  5. Step 5: Solve for x
    x = 15,594,234,799.83/138,790.59
  6. Step 6: Final answer
    x = 112,358.01

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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.