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Finding the Fourth Proportional to 57.18, 85.16 and 53.42

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Solution

The fourth proportional to 57.18, 85.16 and 53.42 is: 79.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.18 : 85.16 = 53.42 : x
  2. Step 2: Convert to fraction form
    57.18/85.16 = 53.42/x
  3. Step 3: Cross multiply
    57.18x = 85.16 × 53.42
  4. Step 4: Simplify right side
    57.18x = 4,549.25
  5. Step 5: Solve for x
    x = 4,549.25/57.18
  6. Step 6: Final answer
    x = 79.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.