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Finding the Fourth Proportional to 2,938.30, 4,407.43 and 747

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Solution

The fourth proportional to 2,938.30, 4,407.43 and 747 is: 1,120.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.30 : 4,407.43 = 747 : x
  2. Step 2: Convert to fraction form
    2,938.30/4,407.43 = 747/x
  3. Step 3: Cross multiply
    2,938.30x = 4,407.43 × 747
  4. Step 4: Simplify right side
    2,938.30x = 3,292,350.21
  5. Step 5: Solve for x
    x = 3,292,350.21/2,938.30
  6. Step 6: Final answer
    x = 1,120.49

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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.