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Finding the Fourth Proportional to 75.19, 103.70 and 66.46

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Solution

The fourth proportional to 75.19, 103.70 and 66.46 is: 91.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.19 : 103.70 = 66.46 : x
  2. Step 2: Convert to fraction form
    75.19/103.70 = 66.46/x
  3. Step 3: Cross multiply
    75.19x = 103.70 × 66.46
  4. Step 4: Simplify right side
    75.19x = 6,891.90
  5. Step 5: Solve for x
    x = 6,891.90/75.19
  6. Step 6: Final answer
    x = 91.66

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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.