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Finding the Fourth Proportional to 638.06, 956.64 and 313.22

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Solution

The fourth proportional to 638.06, 956.64 and 313.22 is: 469.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.06 : 956.64 = 313.22 : x
  2. Step 2: Convert to fraction form
    638.06/956.64 = 313.22/x
  3. Step 3: Cross multiply
    638.06x = 956.64 × 313.22
  4. Step 4: Simplify right side
    638.06x = 299,638.78
  5. Step 5: Solve for x
    x = 299,638.78/638.06
  6. Step 6: Final answer
    x = 469.61

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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.