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Finding the Fourth Proportional to 91.73, 126.56 and 56.76

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Solution

The fourth proportional to 91.73, 126.56 and 56.76 is: 78.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.73 : 126.56 = 56.76 : x
  2. Step 2: Convert to fraction form
    91.73/126.56 = 56.76/x
  3. Step 3: Cross multiply
    91.73x = 126.56 × 56.76
  4. Step 4: Simplify right side
    91.73x = 7,183.55
  5. Step 5: Solve for x
    x = 7,183.55/91.73
  6. Step 6: Final answer
    x = 78.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.