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Finding the Fourth Proportional to 57.76, 86.19 and 57.22

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Solution

The fourth proportional to 57.76, 86.19 and 57.22 is: 85.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 86.19 = 57.22 : x
  2. Step 2: Convert to fraction form
    57.76/86.19 = 57.22/x
  3. Step 3: Cross multiply
    57.76x = 86.19 × 57.22
  4. Step 4: Simplify right side
    57.76x = 4,931.79
  5. Step 5: Solve for x
    x = 4,931.79/57.76
  6. Step 6: Final answer
    x = 85.38

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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.