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Finding the Fourth Proportional to 99.20, 136.88 and 64.76

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Solution

The fourth proportional to 99.20, 136.88 and 64.76 is: 89.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.20 : 136.88 = 64.76 : x
  2. Step 2: Convert to fraction form
    99.20/136.88 = 64.76/x
  3. Step 3: Cross multiply
    99.20x = 136.88 × 64.76
  4. Step 4: Simplify right side
    99.20x = 8,863.34
  5. Step 5: Solve for x
    x = 8,863.34/99.20
  6. Step 6: Final answer
    x = 89.35

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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.