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Finding the Fourth Proportional to 138,680.40, 208,020.60 and 124,683.60

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Solution

The fourth proportional to 138,680.40, 208,020.60 and 124,683.60 is: 187,025.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,680.40 : 208,020.60 = 124,683.60 : x
  2. Step 2: Convert to fraction form
    138,680.40/208,020.60 = 124,683.60/x
  3. Step 3: Cross multiply
    138,680.40x = 208,020.60 × 124,683.60
  4. Step 4: Simplify right side
    138,680.40x = 25,936,757,282.16
  5. Step 5: Solve for x
    x = 25,936,757,282.16/138,680.40
  6. Step 6: Final answer
    x = 187,025.40

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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.