Home / 142,138.75-196,151.42-81,721.20

Finding the Fourth Proportional to 142,138.75, 196,151.42 and 81,721.20

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Solution

The fourth proportional to 142,138.75, 196,151.42 and 81,721.20 is: 112,775.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,138.75 : 196,151.42 = 81,721.20 : x
  2. Step 2: Convert to fraction form
    142,138.75/196,151.42 = 81,721.20/x
  3. Step 3: Cross multiply
    142,138.75x = 196,151.42 × 81,721.20
  4. Step 4: Simplify right side
    142,138.75x = 16,029,730,363.97
  5. Step 5: Solve for x
    x = 16,029,730,363.97/142,138.75
  6. Step 6: Final answer
    x = 112,775.23

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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.