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Finding the Fourth Proportional to 743.85, 1,116.20 and 281.94

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Solution

The fourth proportional to 743.85, 1,116.20 and 281.94 is: 423.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.85 : 1,116.20 = 281.94 : x
  2. Step 2: Convert to fraction form
    743.85/1,116.20 = 281.94/x
  3. Step 3: Cross multiply
    743.85x = 1,116.20 × 281.94
  4. Step 4: Simplify right side
    743.85x = 314,700.02
  5. Step 5: Solve for x
    x = 314,700.02/743.85
  6. Step 6: Final answer
    x = 423.07

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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.