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Finding the Fourth Proportional to 138,389.40, 207,972.90 and 121,282.20

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Solution

The fourth proportional to 138,389.40, 207,972.90 and 121,282.20 is: 182,264.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,389.40 : 207,972.90 = 121,282.20 : x
  2. Step 2: Convert to fraction form
    138,389.40/207,972.90 = 121,282.20/x
  3. Step 3: Cross multiply
    138,389.40x = 207,972.90 × 121,282.20
  4. Step 4: Simplify right side
    138,389.40x = 25,223,410,852.38
  5. Step 5: Solve for x
    x = 25,223,410,852.38/138,389.40
  6. Step 6: Final answer
    x = 182,264.04

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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.