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Finding the Fourth Proportional to 89.78, 123.82 and 62.11

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Solution

The fourth proportional to 89.78, 123.82 and 62.11 is: 85.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.78 : 123.82 = 62.11 : x
  2. Step 2: Convert to fraction form
    89.78/123.82 = 62.11/x
  3. Step 3: Cross multiply
    89.78x = 123.82 × 62.11
  4. Step 4: Simplify right side
    89.78x = 7,690.46
  5. Step 5: Solve for x
    x = 7,690.46/89.78
  6. Step 6: Final answer
    x = 85.66

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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.