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Finding the Fourth Proportional to 100.72, 151.08 and 28.58

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Solution

The fourth proportional to 100.72, 151.08 and 28.58 is: 42.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.72 : 151.08 = 28.58 : x
  2. Step 2: Convert to fraction form
    100.72/151.08 = 28.58/x
  3. Step 3: Cross multiply
    100.72x = 151.08 × 28.58
  4. Step 4: Simplify right side
    100.72x = 4,317.87
  5. Step 5: Solve for x
    x = 4,317.87/100.72
  6. Step 6: Final answer
    x = 42.87

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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.