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Finding the Fourth Proportional to 99.67, 137.48 and 72

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Solution

The fourth proportional to 99.67, 137.48 and 72 is: 99.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.67 : 137.48 = 72 : x
  2. Step 2: Convert to fraction form
    99.67/137.48 = 72/x
  3. Step 3: Cross multiply
    99.67x = 137.48 × 72
  4. Step 4: Simplify right side
    99.67x = 9,898.56
  5. Step 5: Solve for x
    x = 9,898.56/99.67
  6. Step 6: Final answer
    x = 99.31

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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.