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Finding the Fourth Proportional to 76.74, 114.84 and 66.42

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Solution

The fourth proportional to 76.74, 114.84 and 66.42 is: 99.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.74 : 114.84 = 66.42 : x
  2. Step 2: Convert to fraction form
    76.74/114.84 = 66.42/x
  3. Step 3: Cross multiply
    76.74x = 114.84 × 66.42
  4. Step 4: Simplify right side
    76.74x = 7,627.67
  5. Step 5: Solve for x
    x = 7,627.67/76.74
  6. Step 6: Final answer
    x = 99.40

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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.