Home / 129,700.90-178,956.79-78,712.44

Finding the Fourth Proportional to 129,700.90, 178,956.79 and 78,712.44

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Solution

The fourth proportional to 129,700.90, 178,956.79 and 78,712.44 is: 108,604.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,700.90 : 178,956.79 = 78,712.44 : x
  2. Step 2: Convert to fraction form
    129,700.90/178,956.79 = 78,712.44/x
  3. Step 3: Cross multiply
    129,700.90x = 178,956.79 × 78,712.44
  4. Step 4: Simplify right side
    129,700.90x = 14,086,125,595.47
  5. Step 5: Solve for x
    x = 14,086,125,595.47/129,700.90
  6. Step 6: Final answer
    x = 108,604.69

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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.