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Finding the Fourth Proportional to 693.28, 956.75 and 398.64

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Solution

The fourth proportional to 693.28, 956.75 and 398.64 is: 550.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.28 : 956.75 = 398.64 : x
  2. Step 2: Convert to fraction form
    693.28/956.75 = 398.64/x
  3. Step 3: Cross multiply
    693.28x = 956.75 × 398.64
  4. Step 4: Simplify right side
    693.28x = 381,398.82
  5. Step 5: Solve for x
    x = 381,398.82/693.28
  6. Step 6: Final answer
    x = 550.14

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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.