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Finding the Fourth Proportional to 129,720.80, 194,581.20 and 70,671.80

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Solution

The fourth proportional to 129,720.80, 194,581.20 and 70,671.80 is: 106,007.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,720.80 : 194,581.20 = 70,671.80 : x
  2. Step 2: Convert to fraction form
    129,720.80/194,581.20 = 70,671.80/x
  3. Step 3: Cross multiply
    129,720.80x = 194,581.20 × 70,671.80
  4. Step 4: Simplify right side
    129,720.80x = 13,751,403,650.16
  5. Step 5: Solve for x
    x = 13,751,403,650.16/129,720.80
  6. Step 6: Final answer
    x = 106,007.70

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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.