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Finding the Fourth Proportional to 56.87, 85.24 and 31.18

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Solution

The fourth proportional to 56.87, 85.24 and 31.18 is: 46.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.87 : 85.24 = 31.18 : x
  2. Step 2: Convert to fraction form
    56.87/85.24 = 31.18/x
  3. Step 3: Cross multiply
    56.87x = 85.24 × 31.18
  4. Step 4: Simplify right side
    56.87x = 2,657.49
  5. Step 5: Solve for x
    x = 2,657.49/56.87
  6. Step 6: Final answer
    x = 46.73

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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.