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Finding the Fourth Proportional to 76.68, 114.72 and 61.44

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Solution

The fourth proportional to 76.68, 114.72 and 61.44 is: 91.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.68 : 114.72 = 61.44 : x
  2. Step 2: Convert to fraction form
    76.68/114.72 = 61.44/x
  3. Step 3: Cross multiply
    76.68x = 114.72 × 61.44
  4. Step 4: Simplify right side
    76.68x = 7,048.40
  5. Step 5: Solve for x
    x = 7,048.40/76.68
  6. Step 6: Final answer
    x = 91.92

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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.