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Finding the Fourth Proportional to 75.50, 103.74 and 66.24

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Solution

The fourth proportional to 75.50, 103.74 and 66.24 is: 91.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.50 : 103.74 = 66.24 : x
  2. Step 2: Convert to fraction form
    75.50/103.74 = 66.24/x
  3. Step 3: Cross multiply
    75.50x = 103.74 × 66.24
  4. Step 4: Simplify right side
    75.50x = 6,871.74
  5. Step 5: Solve for x
    x = 6,871.74/75.50
  6. Step 6: Final answer
    x = 91.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.