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Finding the Fourth Proportional to 654.74, 981.03 and 638.54

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Solution

The fourth proportional to 654.74, 981.03 and 638.54 is: 956.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.74 : 981.03 = 638.54 : x
  2. Step 2: Convert to fraction form
    654.74/981.03 = 638.54/x
  3. Step 3: Cross multiply
    654.74x = 981.03 × 638.54
  4. Step 4: Simplify right side
    654.74x = 626,426.90
  5. Step 5: Solve for x
    x = 626,426.90/654.74
  6. Step 6: Final answer
    x = 956.76

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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.