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Finding the Fourth Proportional to 74.85, 103.31 and 45.74

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Solution

The fourth proportional to 74.85, 103.31 and 45.74 is: 63.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.85 : 103.31 = 45.74 : x
  2. Step 2: Convert to fraction form
    74.85/103.31 = 45.74/x
  3. Step 3: Cross multiply
    74.85x = 103.31 × 45.74
  4. Step 4: Simplify right side
    74.85x = 4,724.65
  5. Step 5: Solve for x
    x = 4,724.65/74.85
  6. Step 6: Final answer
    x = 63.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.