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Finding the Fourth Proportional to 89.61, 134.26 and 55.28

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Solution

The fourth proportional to 89.61, 134.26 and 55.28 is: 82.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.61 : 134.26 = 55.28 : x
  2. Step 2: Convert to fraction form
    89.61/134.26 = 55.28/x
  3. Step 3: Cross multiply
    89.61x = 134.26 × 55.28
  4. Step 4: Simplify right side
    89.61x = 7,422.09
  5. Step 5: Solve for x
    x = 7,422.09/89.61
  6. Step 6: Final answer
    x = 82.83

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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.