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Finding the Fourth Proportional to 138,148.68, 207,223.02 and 91,390.62

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Solution

The fourth proportional to 138,148.68, 207,223.02 and 91,390.62 is: 137,085.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,148.68 : 207,223.02 = 91,390.62 : x
  2. Step 2: Convert to fraction form
    138,148.68/207,223.02 = 91,390.62/x
  3. Step 3: Cross multiply
    138,148.68x = 207,223.02 × 91,390.62
  4. Step 4: Simplify right side
    138,148.68x = 18,938,240,276.07
  5. Step 5: Solve for x
    x = 18,938,240,276.07/138,148.68
  6. Step 6: Final answer
    x = 137,085.93

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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.