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Finding the Fourth Proportional to 89.20, 123.06 and 61.58

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Solution

The fourth proportional to 89.20, 123.06 and 61.58 is: 84.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.20 : 123.06 = 61.58 : x
  2. Step 2: Convert to fraction form
    89.20/123.06 = 61.58/x
  3. Step 3: Cross multiply
    89.20x = 123.06 × 61.58
  4. Step 4: Simplify right side
    89.20x = 7,578.03
  5. Step 5: Solve for x
    x = 7,578.03/89.20
  6. Step 6: Final answer
    x = 84.96

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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.