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Finding the Fourth Proportional to 129,003.84, 178,019.25 and 71,646.86

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Solution

The fourth proportional to 129,003.84, 178,019.25 and 71,646.86 is: 98,869.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,003.84 : 178,019.25 = 71,646.86 : x
  2. Step 2: Convert to fraction form
    129,003.84/178,019.25 = 71,646.86/x
  3. Step 3: Cross multiply
    129,003.84x = 178,019.25 × 71,646.86
  4. Step 4: Simplify right side
    129,003.84x = 12,754,519,391.96
  5. Step 5: Solve for x
    x = 12,754,519,391.96/129,003.84
  6. Step 6: Final answer
    x = 98,869.30

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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.