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Finding the Fourth Proportional to 88.65, 133.53 and 80.73

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Solution

The fourth proportional to 88.65, 133.53 and 80.73 is: 121.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.65 : 133.53 = 80.73 : x
  2. Step 2: Convert to fraction form
    88.65/133.53 = 80.73/x
  3. Step 3: Cross multiply
    88.65x = 133.53 × 80.73
  4. Step 4: Simplify right side
    88.65x = 10,779.88
  5. Step 5: Solve for x
    x = 10,779.88/88.65
  6. Step 6: Final answer
    x = 121.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.