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Finding the Fourth Proportional to 698.91, 1,049.05 and 390.98

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Solution

The fourth proportional to 698.91, 1,049.05 and 390.98 is: 586.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.91 : 1,049.05 = 390.98 : x
  2. Step 2: Convert to fraction form
    698.91/1,049.05 = 390.98/x
  3. Step 3: Cross multiply
    698.91x = 1,049.05 × 390.98
  4. Step 4: Simplify right side
    698.91x = 410,157.57
  5. Step 5: Solve for x
    x = 410,157.57/698.91
  6. Step 6: Final answer
    x = 586.85

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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.