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Finding the Fourth Proportional to 89.06, 133.55 and 72.65

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Solution

The fourth proportional to 89.06, 133.55 and 72.65 is: 108.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.06 : 133.55 = 72.65 : x
  2. Step 2: Convert to fraction form
    89.06/133.55 = 72.65/x
  3. Step 3: Cross multiply
    89.06x = 133.55 × 72.65
  4. Step 4: Simplify right side
    89.06x = 9,701.38
  5. Step 5: Solve for x
    x = 9,701.38/89.06
  6. Step 6: Final answer
    x = 108.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.