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Finding the Fourth Proportional to 76.91, 106.18 and 47.81

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Solution

The fourth proportional to 76.91, 106.18 and 47.81 is: 66.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.91 : 106.18 = 47.81 : x
  2. Step 2: Convert to fraction form
    76.91/106.18 = 47.81/x
  3. Step 3: Cross multiply
    76.91x = 106.18 × 47.81
  4. Step 4: Simplify right side
    76.91x = 5,076.61
  5. Step 5: Solve for x
    x = 5,076.61/76.91
  6. Step 6: Final answer
    x = 66.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.