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Finding the Fourth Proportional to 99.48, 149.13 and 72.45

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Solution

The fourth proportional to 99.48, 149.13 and 72.45 is: 108.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.48 : 149.13 = 72.45 : x
  2. Step 2: Convert to fraction form
    99.48/149.13 = 72.45/x
  3. Step 3: Cross multiply
    99.48x = 149.13 × 72.45
  4. Step 4: Simplify right side
    99.48x = 10,804.47
  5. Step 5: Solve for x
    x = 10,804.47/99.48
  6. Step 6: Final answer
    x = 108.61

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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.