Home / 129,330.12-178,461.12-72,740.28

Finding the Fourth Proportional to 129,330.12, 178,461.12 and 72,740.28

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Solution

The fourth proportional to 129,330.12, 178,461.12 and 72,740.28 is: 100,373.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,330.12 : 178,461.12 = 72,740.28 : x
  2. Step 2: Convert to fraction form
    129,330.12/178,461.12 = 72,740.28/x
  3. Step 3: Cross multiply
    129,330.12x = 178,461.12 × 72,740.28
  4. Step 4: Simplify right side
    129,330.12x = 12,981,311,837.91
  5. Step 5: Solve for x
    x = 12,981,311,837.91/129,330.12
  6. Step 6: Final answer
    x = 100,373.46

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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.