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Finding the Fourth Proportional to 89.85, 124.10 and 89.11

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Solution

The fourth proportional to 89.85, 124.10 and 89.11 is: 123.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.85 : 124.10 = 89.11 : x
  2. Step 2: Convert to fraction form
    89.85/124.10 = 89.11/x
  3. Step 3: Cross multiply
    89.85x = 124.10 × 89.11
  4. Step 4: Simplify right side
    89.85x = 11,058.55
  5. Step 5: Solve for x
    x = 11,058.55/89.85
  6. Step 6: Final answer
    x = 123.08

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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.