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Finding the Fourth Proportional to 974.72, 1,346.58 and 639.41

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Solution

The fourth proportional to 974.72, 1,346.58 and 639.41 is: 883.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.72 : 1,346.58 = 639.41 : x
  2. Step 2: Convert to fraction form
    974.72/1,346.58 = 639.41/x
  3. Step 3: Cross multiply
    974.72x = 1,346.58 × 639.41
  4. Step 4: Simplify right side
    974.72x = 861,020.08
  5. Step 5: Solve for x
    x = 861,020.08/974.72
  6. Step 6: Final answer
    x = 883.35

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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.