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Finding the Fourth Proportional to 638.49, 956.30 and 313.23

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Solution

The fourth proportional to 638.49, 956.30 and 313.23 is: 469.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.49 : 956.30 = 313.23 : x
  2. Step 2: Convert to fraction form
    638.49/956.30 = 313.23/x
  3. Step 3: Cross multiply
    638.49x = 956.30 × 313.23
  4. Step 4: Simplify right side
    638.49x = 299,540.28
  5. Step 5: Solve for x
    x = 299,540.28/638.49
  6. Step 6: Final answer
    x = 469.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.