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Finding the Fourth Proportional to 698.57, 1,047.99 and 421.19

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Solution

The fourth proportional to 698.57, 1,047.99 and 421.19 is: 631.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.57 : 1,047.99 = 421.19 : x
  2. Step 2: Convert to fraction form
    698.57/1,047.99 = 421.19/x
  3. Step 3: Cross multiply
    698.57x = 1,047.99 × 421.19
  4. Step 4: Simplify right side
    698.57x = 441,402.91
  5. Step 5: Solve for x
    x = 441,402.91/698.57
  6. Step 6: Final answer
    x = 631.87

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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.