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Finding the Fourth Proportional to 129,143.68, 193,611.84 and 72,949.12

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Solution

The fourth proportional to 129,143.68, 193,611.84 and 72,949.12 is: 109,365.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,143.68 : 193,611.84 = 72,949.12 : x
  2. Step 2: Convert to fraction form
    129,143.68/193,611.84 = 72,949.12/x
  3. Step 3: Cross multiply
    129,143.68x = 193,611.84 × 72,949.12
  4. Step 4: Simplify right side
    129,143.68x = 14,123,813,349.58
  5. Step 5: Solve for x
    x = 14,123,813,349.58/129,143.68
  6. Step 6: Final answer
    x = 109,365.11

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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.