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Finding the Fourth Proportional to 654.48, 979.76 and 638.75

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Solution

The fourth proportional to 654.48, 979.76 and 638.75 is: 956.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.48 : 979.76 = 638.75 : x
  2. Step 2: Convert to fraction form
    654.48/979.76 = 638.75/x
  3. Step 3: Cross multiply
    654.48x = 979.76 × 638.75
  4. Step 4: Simplify right side
    654.48x = 625,825.75
  5. Step 5: Solve for x
    x = 625,825.75/654.48
  6. Step 6: Final answer
    x = 956.22

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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.