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Finding the Fourth Proportional to 693.10, 956.44 and 398.39

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Solution

The fourth proportional to 693.10, 956.44 and 398.39 is: 549.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.10 : 956.44 = 398.39 : x
  2. Step 2: Convert to fraction form
    693.10/956.44 = 398.39/x
  3. Step 3: Cross multiply
    693.10x = 956.44 × 398.39
  4. Step 4: Simplify right side
    693.10x = 381,036.13
  5. Step 5: Solve for x
    x = 381,036.13/693.10
  6. Step 6: Final answer
    x = 549.76

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1.5x scale

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.