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Finding the Fourth Proportional to 138,432.81, 207,415.47 and 85,013.76

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Solution

The fourth proportional to 138,432.81, 207,415.47 and 85,013.76 is: 127,377.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,432.81 : 207,415.47 = 85,013.76 : x
  2. Step 2: Convert to fraction form
    138,432.81/207,415.47 = 85,013.76/x
  3. Step 3: Cross multiply
    138,432.81x = 207,415.47 × 85,013.76
  4. Step 4: Simplify right side
    138,432.81x = 17,633,168,986.87
  5. Step 5: Solve for x
    x = 17,633,168,986.87/138,432.81
  6. Step 6: Final answer
    x = 127,377.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.