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Finding the Fourth Proportional to 997.84, 1,378.16 and 625.14

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Solution

The fourth proportional to 997.84, 1,378.16 and 625.14 is: 863.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.84 : 1,378.16 = 625.14 : x
  2. Step 2: Convert to fraction form
    997.84/1,378.16 = 625.14/x
  3. Step 3: Cross multiply
    997.84x = 1,378.16 × 625.14
  4. Step 4: Simplify right side
    997.84x = 861,549.55
  5. Step 5: Solve for x
    x = 861,549.55/997.84
  6. Step 6: Final answer
    x = 863.41

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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.