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Finding the Fourth Proportional to 743.44, 1,114.68 and 281.20

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Solution

The fourth proportional to 743.44, 1,114.68 and 281.20 is: 421.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.44 : 1,114.68 = 281.20 : x
  2. Step 2: Convert to fraction form
    743.44/1,114.68 = 281.20/x
  3. Step 3: Cross multiply
    743.44x = 1,114.68 × 281.20
  4. Step 4: Simplify right side
    743.44x = 313,448.02
  5. Step 5: Solve for x
    x = 313,448.02/743.44
  6. Step 6: Final answer
    x = 421.62

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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.