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Finding the Fourth Proportional to 63.18, 94.78 and 57.20

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Solution

The fourth proportional to 63.18, 94.78 and 57.20 is: 85.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.18 : 94.78 = 57.20 : x
  2. Step 2: Convert to fraction form
    63.18/94.78 = 57.20/x
  3. Step 3: Cross multiply
    63.18x = 94.78 × 57.20
  4. Step 4: Simplify right side
    63.18x = 5,421.42
  5. Step 5: Solve for x
    x = 5,421.42/63.18
  6. Step 6: Final answer
    x = 85.81

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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.