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Finding the Fourth Proportional to 129,031.92, 178,063.92 and 72,443.52

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Solution

The fourth proportional to 129,031.92, 178,063.92 and 72,443.52 is: 99,971.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,031.92 : 178,063.92 = 72,443.52 : x
  2. Step 2: Convert to fraction form
    129,031.92/178,063.92 = 72,443.52/x
  3. Step 3: Cross multiply
    129,031.92x = 178,063.92 × 72,443.52
  4. Step 4: Simplify right side
    129,031.92x = 12,899,577,149.80
  5. Step 5: Solve for x
    x = 12,899,577,149.80/129,031.92
  6. Step 6: Final answer
    x = 99,971.98

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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.