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Finding the Fourth Proportional to 101.06, 139.49 and 66.20

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Solution

The fourth proportional to 101.06, 139.49 and 66.20 is: 91.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.06 : 139.49 = 66.20 : x
  2. Step 2: Convert to fraction form
    101.06/139.49 = 66.20/x
  3. Step 3: Cross multiply
    101.06x = 139.49 × 66.20
  4. Step 4: Simplify right side
    101.06x = 9,234.24
  5. Step 5: Solve for x
    x = 9,234.24/101.06
  6. Step 6: Final answer
    x = 91.37

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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.