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Finding the Fourth Proportional to 129,751.12, 194,700.56 and 85,398.76

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Solution

The fourth proportional to 129,751.12, 194,700.56 and 85,398.76 is: 128,146.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,751.12 : 194,700.56 = 85,398.76 : x
  2. Step 2: Convert to fraction form
    129,751.12/194,700.56 = 85,398.76/x
  3. Step 3: Cross multiply
    129,751.12x = 194,700.56 × 85,398.76
  4. Step 4: Simplify right side
    129,751.12x = 16,627,186,395.31
  5. Step 5: Solve for x
    x = 16,627,186,395.31/129,751.12
  6. Step 6: Final answer
    x = 128,146.77

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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.