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Finding the Fourth Proportional to 742.20, 1,025.10 and 699

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Solution

The fourth proportional to 742.20, 1,025.10 and 699 is: 965.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.20 : 1,025.10 = 699 : x
  2. Step 2: Convert to fraction form
    742.20/1,025.10 = 699/x
  3. Step 3: Cross multiply
    742.20x = 1,025.10 × 699
  4. Step 4: Simplify right side
    742.20x = 716,544.90
  5. Step 5: Solve for x
    x = 716,544.90/742.20
  6. Step 6: Final answer
    x = 965.43

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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.