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Finding the Fourth Proportional to 743.63, 1,115.42 and 280.87

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Solution

The fourth proportional to 743.63, 1,115.42 and 280.87 is: 421.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.63 : 1,115.42 = 280.87 : x
  2. Step 2: Convert to fraction form
    743.63/1,115.42 = 280.87/x
  3. Step 3: Cross multiply
    743.63x = 1,115.42 × 280.87
  4. Step 4: Simplify right side
    743.63x = 313,285.40
  5. Step 5: Solve for x
    x = 313,285.40/743.63
  6. Step 6: Final answer
    x = 421.29

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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.