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Finding the Fourth Proportional to 693.31, 956.65 and 398.47

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Solution

The fourth proportional to 693.31, 956.65 and 398.47 is: 549.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.31 : 956.65 = 398.47 : x
  2. Step 2: Convert to fraction form
    693.31/956.65 = 398.47/x
  3. Step 3: Cross multiply
    693.31x = 956.65 × 398.47
  4. Step 4: Simplify right side
    693.31x = 381,196.33
  5. Step 5: Solve for x
    x = 381,196.33/693.31
  6. Step 6: Final answer
    x = 549.82

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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.