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Finding the Fourth Proportional to 79.88, 110.49 and 65.66

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Solution

The fourth proportional to 79.88, 110.49 and 65.66 is: 90.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.88 : 110.49 = 65.66 : x
  2. Step 2: Convert to fraction form
    79.88/110.49 = 65.66/x
  3. Step 3: Cross multiply
    79.88x = 110.49 × 65.66
  4. Step 4: Simplify right side
    79.88x = 7,254.77
  5. Step 5: Solve for x
    x = 7,254.77/79.88
  6. Step 6: Final answer
    x = 90.82

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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.