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Finding the Fourth Proportional to 91.96, 138 and 57.76

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Solution

The fourth proportional to 91.96, 138 and 57.76 is: 86.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.96 : 138 = 57.76 : x
  2. Step 2: Convert to fraction form
    91.96/138 = 57.76/x
  3. Step 3: Cross multiply
    91.96x = 138 × 57.76
  4. Step 4: Simplify right side
    91.96x = 7,970.88
  5. Step 5: Solve for x
    x = 7,970.88/91.96
  6. Step 6: Final answer
    x = 86.68

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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.