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Finding the Fourth Proportional to 101.43, 139.99 and 83.20

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Solution

The fourth proportional to 101.43, 139.99 and 83.20 is: 114.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.43 : 139.99 = 83.20 : x
  2. Step 2: Convert to fraction form
    101.43/139.99 = 83.20/x
  3. Step 3: Cross multiply
    101.43x = 139.99 × 83.20
  4. Step 4: Simplify right side
    101.43x = 11,647.17
  5. Step 5: Solve for x
    x = 11,647.17/101.43
  6. Step 6: Final answer
    x = 114.83

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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.