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Finding the Fourth Proportional to 440.32, 663.42 and 398.68

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Solution

The fourth proportional to 440.32, 663.42 and 398.68 is: 600.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.32 : 663.42 = 398.68 : x
  2. Step 2: Convert to fraction form
    440.32/663.42 = 398.68/x
  3. Step 3: Cross multiply
    440.32x = 663.42 × 398.68
  4. Step 4: Simplify right side
    440.32x = 264,492.29
  5. Step 5: Solve for x
    x = 264,492.29/440.32
  6. Step 6: Final answer
    x = 600.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.