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Finding the Fourth Proportional to 638.12, 956.36 and 313.58

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Solution

The fourth proportional to 638.12, 956.36 and 313.58 is: 469.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.12 : 956.36 = 313.58 : x
  2. Step 2: Convert to fraction form
    638.12/956.36 = 313.58/x
  3. Step 3: Cross multiply
    638.12x = 956.36 × 313.58
  4. Step 4: Simplify right side
    638.12x = 299,895.37
  5. Step 5: Solve for x
    x = 299,895.37/638.12
  6. Step 6: Final answer
    x = 469.97

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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.