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Finding the Fourth Proportional to 76.98, 106.38 and 66.18

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Solution

The fourth proportional to 76.98, 106.38 and 66.18 is: 91.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.98 : 106.38 = 66.18 : x
  2. Step 2: Convert to fraction form
    76.98/106.38 = 66.18/x
  3. Step 3: Cross multiply
    76.98x = 106.38 × 66.18
  4. Step 4: Simplify right side
    76.98x = 7,040.23
  5. Step 5: Solve for x
    x = 7,040.23/76.98
  6. Step 6: Final answer
    x = 91.46

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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.