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Finding the Fourth Proportional to 744.02, 1,116.18 and 281.78

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Solution

The fourth proportional to 744.02, 1,116.18 and 281.78 is: 422.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.02 : 1,116.18 = 281.78 : x
  2. Step 2: Convert to fraction form
    744.02/1,116.18 = 281.78/x
  3. Step 3: Cross multiply
    744.02x = 1,116.18 × 281.78
  4. Step 4: Simplify right side
    744.02x = 314,511.62
  5. Step 5: Solve for x
    x = 314,511.62/744.02
  6. Step 6: Final answer
    x = 422.72

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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.