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Finding the Fourth Proportional to 77.68, 107.14 and 66.13

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Solution

The fourth proportional to 77.68, 107.14 and 66.13 is: 91.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.68 : 107.14 = 66.13 : x
  2. Step 2: Convert to fraction form
    77.68/107.14 = 66.13/x
  3. Step 3: Cross multiply
    77.68x = 107.14 × 66.13
  4. Step 4: Simplify right side
    77.68x = 7,085.17
  5. Step 5: Solve for x
    x = 7,085.17/77.68
  6. Step 6: Final answer
    x = 91.21

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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.