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Finding the Fourth Proportional to 974.96, 1,344.51 and 638.36

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Solution

The fourth proportional to 974.96, 1,344.51 and 638.36 is: 880.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.96 : 1,344.51 = 638.36 : x
  2. Step 2: Convert to fraction form
    974.96/1,344.51 = 638.36/x
  3. Step 3: Cross multiply
    974.96x = 1,344.51 × 638.36
  4. Step 4: Simplify right side
    974.96x = 858,274.68
  5. Step 5: Solve for x
    x = 858,274.68/974.96
  6. Step 6: Final answer
    x = 880.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.