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Finding the Fourth Proportional to 74.39, 102.20 and 63.99

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Solution

The fourth proportional to 74.39, 102.20 and 63.99 is: 87.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.39 : 102.20 = 63.99 : x
  2. Step 2: Convert to fraction form
    74.39/102.20 = 63.99/x
  3. Step 3: Cross multiply
    74.39x = 102.20 × 63.99
  4. Step 4: Simplify right side
    74.39x = 6,539.46
  5. Step 5: Solve for x
    x = 6,539.46/74.39
  6. Step 6: Final answer
    x = 87.91

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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.