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Finding the Fourth Proportional to 99.34, 136.87 and 66.53

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Solution

The fourth proportional to 99.34, 136.87 and 66.53 is: 91.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.34 : 136.87 = 66.53 : x
  2. Step 2: Convert to fraction form
    99.34/136.87 = 66.53/x
  3. Step 3: Cross multiply
    99.34x = 136.87 × 66.53
  4. Step 4: Simplify right side
    99.34x = 9,106.14
  5. Step 5: Solve for x
    x = 9,106.14/99.34
  6. Step 6: Final answer
    x = 91.67

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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.