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Finding the Fourth Proportional to 138,436.80, 207,655.20 and 135,812.40

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Solution

The fourth proportional to 138,436.80, 207,655.20 and 135,812.40 is: 203,718.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,436.80 : 207,655.20 = 135,812.40 : x
  2. Step 2: Convert to fraction form
    138,436.80/207,655.20 = 135,812.40/x
  3. Step 3: Cross multiply
    138,436.80x = 207,655.20 × 135,812.40
  4. Step 4: Simplify right side
    138,436.80x = 28,202,151,084.48
  5. Step 5: Solve for x
    x = 28,202,151,084.48/138,436.80
  6. Step 6: Final answer
    x = 203,718.60

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1.5x scale

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.