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Finding the Fourth Proportional to 65.18, 89.85 and 40.61

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Solution

The fourth proportional to 65.18, 89.85 and 40.61 is: 55.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.18 : 89.85 = 40.61 : x
  2. Step 2: Convert to fraction form
    65.18/89.85 = 40.61/x
  3. Step 3: Cross multiply
    65.18x = 89.85 × 40.61
  4. Step 4: Simplify right side
    65.18x = 3,648.36
  5. Step 5: Solve for x
    x = 3,648.36/65.18
  6. Step 6: Final answer
    x = 55.98

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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.