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Finding the Fourth Proportional to 57.33, 86.28 and 42.96

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Solution

The fourth proportional to 57.33, 86.28 and 42.96 is: 64.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.33 : 86.28 = 42.96 : x
  2. Step 2: Convert to fraction form
    57.33/86.28 = 42.96/x
  3. Step 3: Cross multiply
    57.33x = 86.28 × 42.96
  4. Step 4: Simplify right side
    57.33x = 3,706.81
  5. Step 5: Solve for x
    x = 3,706.81/57.33
  6. Step 6: Final answer
    x = 64.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.