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Finding the Fourth Proportional to 149.15, 223.78 and 57.91

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Solution

The fourth proportional to 149.15, 223.78 and 57.91 is: 86.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.15 : 223.78 = 57.91 : x
  2. Step 2: Convert to fraction form
    149.15/223.78 = 57.91/x
  3. Step 3: Cross multiply
    149.15x = 223.78 × 57.91
  4. Step 4: Simplify right side
    149.15x = 12,958.05
  5. Step 5: Solve for x
    x = 12,958.05/149.15
  6. Step 6: Final answer
    x = 86.88

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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.