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Finding the Fourth Proportional to 111.60, 152.88 and 101.88

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Solution

The fourth proportional to 111.60, 152.88 and 101.88 is: 139.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.60 : 152.88 = 101.88 : x
  2. Step 2: Convert to fraction form
    111.60/152.88 = 101.88/x
  3. Step 3: Cross multiply
    111.60x = 152.88 × 101.88
  4. Step 4: Simplify right side
    111.60x = 15,575.41
  5. Step 5: Solve for x
    x = 15,575.41/111.60
  6. Step 6: Final answer
    x = 139.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.