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Finding the Fourth Proportional to 101.16, 151.40 and 55.40

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Solution

The fourth proportional to 101.16, 151.40 and 55.40 is: 82.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.16 : 151.40 = 55.40 : x
  2. Step 2: Convert to fraction form
    101.16/151.40 = 55.40/x
  3. Step 3: Cross multiply
    101.16x = 151.40 × 55.40
  4. Step 4: Simplify right side
    101.16x = 8,387.56
  5. Step 5: Solve for x
    x = 8,387.56/101.16
  6. Step 6: Final answer
    x = 82.91

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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.