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Finding the Fourth Proportional to 699.90, 1,049.85 and 426.53

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Solution

The fourth proportional to 699.90, 1,049.85 and 426.53 is: 639.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.90 : 1,049.85 = 426.53 : x
  2. Step 2: Convert to fraction form
    699.90/1,049.85 = 426.53/x
  3. Step 3: Cross multiply
    699.90x = 1,049.85 × 426.53
  4. Step 4: Simplify right side
    699.90x = 447,787.27
  5. Step 5: Solve for x
    x = 447,787.27/699.90
  6. Step 6: Final answer
    x = 639.79

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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.