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Finding the Fourth Proportional to 74.56, 112.24 and 68.08

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Solution

The fourth proportional to 74.56, 112.24 and 68.08 is: 102.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.56 : 112.24 = 68.08 : x
  2. Step 2: Convert to fraction form
    74.56/112.24 = 68.08/x
  3. Step 3: Cross multiply
    74.56x = 112.24 × 68.08
  4. Step 4: Simplify right side
    74.56x = 7,641.30
  5. Step 5: Solve for x
    x = 7,641.30/74.56
  6. Step 6: Final answer
    x = 102.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.