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Finding the Fourth Proportional to 142,079.20, 213,118.80 and 89,720.80

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Solution

The fourth proportional to 142,079.20, 213,118.80 and 89,720.80 is: 134,581.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,079.20 : 213,118.80 = 89,720.80 : x
  2. Step 2: Convert to fraction form
    142,079.20/213,118.80 = 89,720.80/x
  3. Step 3: Cross multiply
    142,079.20x = 213,118.80 × 89,720.80
  4. Step 4: Simplify right side
    142,079.20x = 19,121,189,231.04
  5. Step 5: Solve for x
    x = 19,121,189,231.04/142,079.20
  6. Step 6: Final answer
    x = 134,581.20

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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.