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Finding the Fourth Proportional to 129,504.56, 178,742.80 and 81,725.76

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Solution

The fourth proportional to 129,504.56, 178,742.80 and 81,725.76 is: 112,798.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,504.56 : 178,742.80 = 81,725.76 : x
  2. Step 2: Convert to fraction form
    129,504.56/178,742.80 = 81,725.76/x
  3. Step 3: Cross multiply
    129,504.56x = 178,742.80 × 81,725.76
  4. Step 4: Simplify right side
    129,504.56x = 14,607,891,174.53
  5. Step 5: Solve for x
    x = 14,607,891,174.53/129,504.56
  6. Step 6: Final answer
    x = 112,798.28

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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.