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Finding the Fourth Proportional to 743.10, 1,113.28 and 331.21

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Solution

The fourth proportional to 743.10, 1,113.28 and 331.21 is: 496.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.10 : 1,113.28 = 331.21 : x
  2. Step 2: Convert to fraction form
    743.10/1,113.28 = 331.21/x
  3. Step 3: Cross multiply
    743.10x = 1,113.28 × 331.21
  4. Step 4: Simplify right side
    743.10x = 368,730.03
  5. Step 5: Solve for x
    x = 368,730.03/743.10
  6. Step 6: Final answer
    x = 496.21

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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.