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Finding the Fourth Proportional to 60.81, 83.86 and 40.11

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Solution

The fourth proportional to 60.81, 83.86 and 40.11 is: 55.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.81 : 83.86 = 40.11 : x
  2. Step 2: Convert to fraction form
    60.81/83.86 = 40.11/x
  3. Step 3: Cross multiply
    60.81x = 83.86 × 40.11
  4. Step 4: Simplify right side
    60.81x = 3,363.62
  5. Step 5: Solve for x
    x = 3,363.62/60.81
  6. Step 6: Final answer
    x = 55.31

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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.