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Finding the Fourth Proportional to 138,680.20, 208,020.30 and 103,688.20

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Solution

The fourth proportional to 138,680.20, 208,020.30 and 103,688.20 is: 155,532.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,680.20 : 208,020.30 = 103,688.20 : x
  2. Step 2: Convert to fraction form
    138,680.20/208,020.30 = 103,688.20/x
  3. Step 3: Cross multiply
    138,680.20x = 208,020.30 × 103,688.20
  4. Step 4: Simplify right side
    138,680.20x = 21,569,250,470.46
  5. Step 5: Solve for x
    x = 21,569,250,470.46/138,680.20
  6. Step 6: Final answer
    x = 155,532.30

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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.