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Finding the Fourth Proportional to 76.57, 114.71 and 47.66

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Solution

The fourth proportional to 76.57, 114.71 and 47.66 is: 71.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.57 : 114.71 = 47.66 : x
  2. Step 2: Convert to fraction form
    76.57/114.71 = 47.66/x
  3. Step 3: Cross multiply
    76.57x = 114.71 × 47.66
  4. Step 4: Simplify right side
    76.57x = 5,467.18
  5. Step 5: Solve for x
    x = 5,467.18/76.57
  6. Step 6: Final answer
    x = 71.40

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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.