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Finding the Fourth Proportional to 76.56, 114.85 and 61.28

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Solution

The fourth proportional to 76.56, 114.85 and 61.28 is: 91.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.56 : 114.85 = 61.28 : x
  2. Step 2: Convert to fraction form
    76.56/114.85 = 61.28/x
  3. Step 3: Cross multiply
    76.56x = 114.85 × 61.28
  4. Step 4: Simplify right side
    76.56x = 7,037.13
  5. Step 5: Solve for x
    x = 7,037.13/76.56
  6. Step 6: Final answer
    x = 91.91

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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.