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Finding the Fourth Proportional to 698.20, 1,047.57 and 265.39

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Solution

The fourth proportional to 698.20, 1,047.57 and 265.39 is: 398.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.20 : 1,047.57 = 265.39 : x
  2. Step 2: Convert to fraction form
    698.20/1,047.57 = 265.39/x
  3. Step 3: Cross multiply
    698.20x = 1,047.57 × 265.39
  4. Step 4: Simplify right side
    698.20x = 278,014.60
  5. Step 5: Solve for x
    x = 278,014.60/698.20
  6. Step 6: Final answer
    x = 398.19

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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.