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Finding the Fourth Proportional to 138,123.93, 207,185.90 and 91,365.87

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Solution

The fourth proportional to 138,123.93, 207,185.90 and 91,365.87 is: 137,048.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,123.93 : 207,185.90 = 91,365.87 : x
  2. Step 2: Convert to fraction form
    138,123.93/207,185.90 = 91,365.87/x
  3. Step 3: Cross multiply
    138,123.93x = 207,185.90 × 91,365.87
  4. Step 4: Simplify right side
    138,123.93x = 18,929,719,548.40
  5. Step 5: Solve for x
    x = 18,929,719,548.40/138,123.93
  6. Step 6: Final answer
    x = 137,048.81

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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.