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Finding the Fourth Proportional to 40.36, 60.12 and 38.91

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Solution

The fourth proportional to 40.36, 60.12 and 38.91 is: 57.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.36 : 60.12 = 38.91 : x
  2. Step 2: Convert to fraction form
    40.36/60.12 = 38.91/x
  3. Step 3: Cross multiply
    40.36x = 60.12 × 38.91
  4. Step 4: Simplify right side
    40.36x = 2,339.27
  5. Step 5: Solve for x
    x = 2,339.27/40.36
  6. Step 6: Final answer
    x = 57.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.