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Finding the Fourth Proportional to 76.62, 114.89 and 47.68

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Solution

The fourth proportional to 76.62, 114.89 and 47.68 is: 71.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.62 : 114.89 = 47.68 : x
  2. Step 2: Convert to fraction form
    76.62/114.89 = 47.68/x
  3. Step 3: Cross multiply
    76.62x = 114.89 × 47.68
  4. Step 4: Simplify right side
    76.62x = 5,478.21
  5. Step 5: Solve for x
    x = 5,478.21/76.62
  6. Step 6: Final answer
    x = 71.50

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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.