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Finding the Fourth Proportional to 101.12, 139.68 and 88.16

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Solution

The fourth proportional to 101.12, 139.68 and 88.16 is: 121.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.12 : 139.68 = 88.16 : x
  2. Step 2: Convert to fraction form
    101.12/139.68 = 88.16/x
  3. Step 3: Cross multiply
    101.12x = 139.68 × 88.16
  4. Step 4: Simplify right side
    101.12x = 12,314.19
  5. Step 5: Solve for x
    x = 12,314.19/101.12
  6. Step 6: Final answer
    x = 121.78

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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.