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Finding the Fourth Proportional to 74.74, 112.10 and 28.47

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Solution

The fourth proportional to 74.74, 112.10 and 28.47 is: 42.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.74 : 112.10 = 28.47 : x
  2. Step 2: Convert to fraction form
    74.74/112.10 = 28.47/x
  3. Step 3: Cross multiply
    74.74x = 112.10 × 28.47
  4. Step 4: Simplify right side
    74.74x = 3,191.49
  5. Step 5: Solve for x
    x = 3,191.49/74.74
  6. Step 6: Final answer
    x = 42.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.