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Finding the Fourth Proportional to 1,267.24, 1,748.70 and 743.20

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Solution

The fourth proportional to 1,267.24, 1,748.70 and 743.20 is: 1,025.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.24 : 1,748.70 = 743.20 : x
  2. Step 2: Convert to fraction form
    1,267.24/1,748.70 = 743.20/x
  3. Step 3: Cross multiply
    1,267.24x = 1,748.70 × 743.20
  4. Step 4: Simplify right side
    1,267.24x = 1,299,633.84
  5. Step 5: Solve for x
    x = 1,299,633.84/1,267.24
  6. Step 6: Final answer
    x = 1,025.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.