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Finding the Fourth Proportional to 99.48, 137.38 and 65

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Solution

The fourth proportional to 99.48, 137.38 and 65 is: 89.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.48 : 137.38 = 65 : x
  2. Step 2: Convert to fraction form
    99.48/137.38 = 65/x
  3. Step 3: Cross multiply
    99.48x = 137.38 × 65
  4. Step 4: Simplify right side
    99.48x = 8,929.70
  5. Step 5: Solve for x
    x = 8,929.70/99.48
  6. Step 6: Final answer
    x = 89.76

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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.