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Finding the Fourth Proportional to 698.46, 1,049.61 and 425.34

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Solution

The fourth proportional to 698.46, 1,049.61 and 425.34 is: 639.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.46 : 1,049.61 = 425.34 : x
  2. Step 2: Convert to fraction form
    698.46/1,049.61 = 425.34/x
  3. Step 3: Cross multiply
    698.46x = 1,049.61 × 425.34
  4. Step 4: Simplify right side
    698.46x = 446,441.12
  5. Step 5: Solve for x
    x = 446,441.12/698.46
  6. Step 6: Final answer
    x = 639.18

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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.