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Finding the Fourth Proportional to 101.60, 140.21 and 64.76

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Solution

The fourth proportional to 101.60, 140.21 and 64.76 is: 89.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.60 : 140.21 = 64.76 : x
  2. Step 2: Convert to fraction form
    101.60/140.21 = 64.76/x
  3. Step 3: Cross multiply
    101.60x = 140.21 × 64.76
  4. Step 4: Simplify right side
    101.60x = 9,078.97
  5. Step 5: Solve for x
    x = 9,078.97/101.60
  6. Step 6: Final answer
    x = 89.36

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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.