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Finding the Fourth Proportional to 129,398.64, 178,568.76 and 72,037.08

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Solution

The fourth proportional to 129,398.64, 178,568.76 and 72,037.08 is: 99,410.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,398.64 : 178,568.76 = 72,037.08 : x
  2. Step 2: Convert to fraction form
    129,398.64/178,568.76 = 72,037.08/x
  3. Step 3: Cross multiply
    129,398.64x = 178,568.76 × 72,037.08
  4. Step 4: Simplify right side
    129,398.64x = 12,863,572,049.62
  5. Step 5: Solve for x
    x = 12,863,572,049.62/129,398.64
  6. Step 6: Final answer
    x = 99,410.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.