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Finding the Fourth Proportional to 61.33, 91.48 and 51.76

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Solution

The fourth proportional to 61.33, 91.48 and 51.76 is: 77.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.33 : 91.48 = 51.76 : x
  2. Step 2: Convert to fraction form
    61.33/91.48 = 51.76/x
  3. Step 3: Cross multiply
    61.33x = 91.48 × 51.76
  4. Step 4: Simplify right side
    61.33x = 4,735.00
  5. Step 5: Solve for x
    x = 4,735.00/61.33
  6. Step 6: Final answer
    x = 77.21

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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.