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Finding the Fourth Proportional to 974.92, 1,344.18 and 787.72

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Solution

The fourth proportional to 974.92, 1,344.18 and 787.72 is: 1,086.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.92 : 1,344.18 = 787.72 : x
  2. Step 2: Convert to fraction form
    974.92/1,344.18 = 787.72/x
  3. Step 3: Cross multiply
    974.92x = 1,344.18 × 787.72
  4. Step 4: Simplify right side
    974.92x = 1,058,837.47
  5. Step 5: Solve for x
    x = 1,058,837.47/974.92
  6. Step 6: Final answer
    x = 1,086.08

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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.