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Finding the Fourth Proportional to 89.91, 124.13 and 65.41

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Solution

The fourth proportional to 89.91, 124.13 and 65.41 is: 90.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.91 : 124.13 = 65.41 : x
  2. Step 2: Convert to fraction form
    89.91/124.13 = 65.41/x
  3. Step 3: Cross multiply
    89.91x = 124.13 × 65.41
  4. Step 4: Simplify right side
    89.91x = 8,119.20
  5. Step 5: Solve for x
    x = 8,119.20/89.91
  6. Step 6: Final answer
    x = 90.30

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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.