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Finding the Fourth Proportional to 99.76, 137.63 and 72.08

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Solution

The fourth proportional to 99.76, 137.63 and 72.08 is: 99.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.76 : 137.63 = 72.08 : x
  2. Step 2: Convert to fraction form
    99.76/137.63 = 72.08/x
  3. Step 3: Cross multiply
    99.76x = 137.63 × 72.08
  4. Step 4: Simplify right side
    99.76x = 9,920.35
  5. Step 5: Solve for x
    x = 9,920.35/99.76
  6. Step 6: Final answer
    x = 99.44

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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.