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Finding the Fourth Proportional to 693.44, 956.76 and 398.60

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Solution

The fourth proportional to 693.44, 956.76 and 398.60 is: 549.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.44 : 956.76 = 398.60 : x
  2. Step 2: Convert to fraction form
    693.44/956.76 = 398.60/x
  3. Step 3: Cross multiply
    693.44x = 956.76 × 398.60
  4. Step 4: Simplify right side
    693.44x = 381,364.54
  5. Step 5: Solve for x
    x = 381,364.54/693.44
  6. Step 6: Final answer
    x = 549.96

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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.