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Finding the Fourth Proportional to 144.21, 216.13 and 61.86

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Solution

The fourth proportional to 144.21, 216.13 and 61.86 is: 92.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.21 : 216.13 = 61.86 : x
  2. Step 2: Convert to fraction form
    144.21/216.13 = 61.86/x
  3. Step 3: Cross multiply
    144.21x = 216.13 × 61.86
  4. Step 4: Simplify right side
    144.21x = 13,369.80
  5. Step 5: Solve for x
    x = 13,369.80/144.21
  6. Step 6: Final answer
    x = 92.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.