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Finding the Fourth Proportional to 138,390.93, 207,586.40 and 91,632.87

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Solution

The fourth proportional to 138,390.93, 207,586.40 and 91,632.87 is: 137,449.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,390.93 : 207,586.40 = 91,632.87 : x
  2. Step 2: Convert to fraction form
    138,390.93/207,586.40 = 91,632.87/x
  3. Step 3: Cross multiply
    138,390.93x = 207,586.40 × 91,632.87
  4. Step 4: Simplify right side
    138,390.93x = 19,021,737,146.80
  5. Step 5: Solve for x
    x = 19,021,737,146.80/138,390.93
  6. Step 6: Final answer
    x = 137,449.31

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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.