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Finding the Fourth Proportional to 77.12, 106.50 and 66.14

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Solution

The fourth proportional to 77.12, 106.50 and 66.14 is: 91.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.12 : 106.50 = 66.14 : x
  2. Step 2: Convert to fraction form
    77.12/106.50 = 66.14/x
  3. Step 3: Cross multiply
    77.12x = 106.50 × 66.14
  4. Step 4: Simplify right side
    77.12x = 7,043.91
  5. Step 5: Solve for x
    x = 7,043.91/77.12
  6. Step 6: Final answer
    x = 91.34

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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.