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Finding the Fourth Proportional to 104.99, 144.90 and 72.25

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Solution

The fourth proportional to 104.99, 144.90 and 72.25 is: 99.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.99 : 144.90 = 72.25 : x
  2. Step 2: Convert to fraction form
    104.99/144.90 = 72.25/x
  3. Step 3: Cross multiply
    104.99x = 144.90 × 72.25
  4. Step 4: Simplify right side
    104.99x = 10,468.66
  5. Step 5: Solve for x
    x = 10,468.66/104.99
  6. Step 6: Final answer
    x = 99.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.