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Finding the Fourth Proportional to 101.27, 139.60 and 64.42

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Solution

The fourth proportional to 101.27, 139.60 and 64.42 is: 88.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.27 : 139.60 = 64.42 : x
  2. Step 2: Convert to fraction form
    101.27/139.60 = 64.42/x
  3. Step 3: Cross multiply
    101.27x = 139.60 × 64.42
  4. Step 4: Simplify right side
    101.27x = 8,993.03
  5. Step 5: Solve for x
    x = 8,993.03/101.27
  6. Step 6: Final answer
    x = 88.80

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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.