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Finding the Fourth Proportional to 698.67, 1,047.87 and 438.66

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Solution

The fourth proportional to 698.67, 1,047.87 and 438.66 is: 657.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.67 : 1,047.87 = 438.66 : x
  2. Step 2: Convert to fraction form
    698.67/1,047.87 = 438.66/x
  3. Step 3: Cross multiply
    698.67x = 1,047.87 × 438.66
  4. Step 4: Simplify right side
    698.67x = 459,658.65
  5. Step 5: Solve for x
    x = 459,658.65/698.67
  6. Step 6: Final answer
    x = 657.91

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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.