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Finding the Fourth Proportional to 101.68, 152.69 and 85.55

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Solution

The fourth proportional to 101.68, 152.69 and 85.55 is: 128.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.68 : 152.69 = 85.55 : x
  2. Step 2: Convert to fraction form
    101.68/152.69 = 85.55/x
  3. Step 3: Cross multiply
    101.68x = 152.69 × 85.55
  4. Step 4: Simplify right side
    101.68x = 13,061.44
  5. Step 5: Solve for x
    x = 13,061.44/101.68
  6. Step 6: Final answer
    x = 128.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.