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Finding the Fourth Proportional to 100.80, 151.44 and 72.08

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Solution

The fourth proportional to 100.80, 151.44 and 72.08 is: 108.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.80 : 151.44 = 72.08 : x
  2. Step 2: Convert to fraction form
    100.80/151.44 = 72.08/x
  3. Step 3: Cross multiply
    100.80x = 151.44 × 72.08
  4. Step 4: Simplify right side
    100.80x = 10,915.80
  5. Step 5: Solve for x
    x = 10,915.80/100.80
  6. Step 6: Final answer
    x = 108.29

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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.