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Finding the Fourth Proportional to 698.77, 1,047.21 and 373.96

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Solution

The fourth proportional to 698.77, 1,047.21 and 373.96 is: 560.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.77 : 1,047.21 = 373.96 : x
  2. Step 2: Convert to fraction form
    698.77/1,047.21 = 373.96/x
  3. Step 3: Cross multiply
    698.77x = 1,047.21 × 373.96
  4. Step 4: Simplify right side
    698.77x = 391,614.65
  5. Step 5: Solve for x
    x = 391,614.65/698.77
  6. Step 6: Final answer
    x = 560.43

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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.