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Finding the Fourth Proportional to 63.48, 86.96 and 57

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Solution

The fourth proportional to 63.48, 86.96 and 57 is: 78.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.48 : 86.96 = 57 : x
  2. Step 2: Convert to fraction form
    63.48/86.96 = 57/x
  3. Step 3: Cross multiply
    63.48x = 86.96 × 57
  4. Step 4: Simplify right side
    63.48x = 4,956.72
  5. Step 5: Solve for x
    x = 4,956.72/63.48
  6. Step 6: Final answer
    x = 78.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.