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Finding the Fourth Proportional to 693.43, 956.90 and 398.70

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Solution

The fourth proportional to 693.43, 956.90 and 398.70 is: 550.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.43 : 956.90 = 398.70 : x
  2. Step 2: Convert to fraction form
    693.43/956.90 = 398.70/x
  3. Step 3: Cross multiply
    693.43x = 956.90 × 398.70
  4. Step 4: Simplify right side
    693.43x = 381,514.04
  5. Step 5: Solve for x
    x = 381,514.04/693.43
  6. Step 6: Final answer
    x = 550.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.