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Finding the Fourth Proportional to 75.88, 104.68 and 65.66

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Solution

The fourth proportional to 75.88, 104.68 and 65.66 is: 90.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.88 : 104.68 = 65.66 : x
  2. Step 2: Convert to fraction form
    75.88/104.68 = 65.66/x
  3. Step 3: Cross multiply
    75.88x = 104.68 × 65.66
  4. Step 4: Simplify right side
    75.88x = 6,873.29
  5. Step 5: Solve for x
    x = 6,873.29/75.88
  6. Step 6: Final answer
    x = 90.58

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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.