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Finding the Fourth Proportional to 638.95, 956.79 and 585.49

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Solution

The fourth proportional to 638.95, 956.79 and 585.49 is: 876.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.95 : 956.79 = 585.49 : x
  2. Step 2: Convert to fraction form
    638.95/956.79 = 585.49/x
  3. Step 3: Cross multiply
    638.95x = 956.79 × 585.49
  4. Step 4: Simplify right side
    638.95x = 560,190.98
  5. Step 5: Solve for x
    x = 560,190.98/638.95
  6. Step 6: Final answer
    x = 876.74

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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.