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Finding the Fourth Proportional to 138,670.62, 191,360.97 and 87,711.18

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Solution

The fourth proportional to 138,670.62, 191,360.97 and 87,711.18 is: 121,038.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,670.62 : 191,360.97 = 87,711.18 : x
  2. Step 2: Convert to fraction form
    138,670.62/191,360.97 = 87,711.18/x
  3. Step 3: Cross multiply
    138,670.62x = 191,360.97 × 87,711.18
  4. Step 4: Simplify right side
    138,670.62x = 16,784,496,484.64
  5. Step 5: Solve for x
    x = 16,784,496,484.64/138,670.62
  6. Step 6: Final answer
    x = 121,038.59

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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.