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Finding the Fourth Proportional to 142,480.80, 213,721.20 and 68,752.80

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Solution

The fourth proportional to 142,480.80, 213,721.20 and 68,752.80 is: 103,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,480.80 : 213,721.20 = 68,752.80 : x
  2. Step 2: Convert to fraction form
    142,480.80/213,721.20 = 68,752.80/x
  3. Step 3: Cross multiply
    142,480.80x = 213,721.20 × 68,752.80
  4. Step 4: Simplify right side
    142,480.80x = 14,693,930,919.36
  5. Step 5: Solve for x
    x = 14,693,930,919.36/142,480.80
  6. Step 6: Final answer
    x = 103,129.20

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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.