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Finding the Fourth Proportional to 74.90, 112.39 and 42.40

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Solution

The fourth proportional to 74.90, 112.39 and 42.40 is: 63.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.90 : 112.39 = 42.40 : x
  2. Step 2: Convert to fraction form
    74.90/112.39 = 42.40/x
  3. Step 3: Cross multiply
    74.90x = 112.39 × 42.40
  4. Step 4: Simplify right side
    74.90x = 4,765.37
  5. Step 5: Solve for x
    x = 4,765.37/74.90
  6. Step 6: Final answer
    x = 63.62

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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.