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Finding the Fourth Proportional to 743.03, 1,113.94 and 280.55

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Solution

The fourth proportional to 743.03, 1,113.94 and 280.55 is: 420.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.03 : 1,113.94 = 280.55 : x
  2. Step 2: Convert to fraction form
    743.03/1,113.94 = 280.55/x
  3. Step 3: Cross multiply
    743.03x = 1,113.94 × 280.55
  4. Step 4: Simplify right side
    743.03x = 312,508.89
  5. Step 5: Solve for x
    x = 312,508.89/743.03
  6. Step 6: Final answer
    x = 420.59

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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.