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Finding the Fourth Proportional to 138,611.60, 207,868.80 and 72,029.60

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Solution

The fourth proportional to 138,611.60, 207,868.80 and 72,029.60 is: 108,019.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,611.60 : 207,868.80 = 72,029.60 : x
  2. Step 2: Convert to fraction form
    138,611.60/207,868.80 = 72,029.60/x
  3. Step 3: Cross multiply
    138,611.60x = 207,868.80 × 72,029.60
  4. Step 4: Simplify right side
    138,611.60x = 14,972,706,516.48
  5. Step 5: Solve for x
    x = 14,972,706,516.48/138,611.60
  6. Step 6: Final answer
    x = 108,019.14

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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.