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Finding the Fourth Proportional to 89.63, 133.92 and 73.17

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Solution

The fourth proportional to 89.63, 133.92 and 73.17 is: 109.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.63 : 133.92 = 73.17 : x
  2. Step 2: Convert to fraction form
    89.63/133.92 = 73.17/x
  3. Step 3: Cross multiply
    89.63x = 133.92 × 73.17
  4. Step 4: Simplify right side
    89.63x = 9,798.93
  5. Step 5: Solve for x
    x = 9,798.93/89.63
  6. Step 6: Final answer
    x = 109.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.