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Finding the Fourth Proportional to 997.93, 1,378.19 and 625.78

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Solution

The fourth proportional to 997.93, 1,378.19 and 625.78 is: 864.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.93 : 1,378.19 = 625.78 : x
  2. Step 2: Convert to fraction form
    997.93/1,378.19 = 625.78/x
  3. Step 3: Cross multiply
    997.93x = 1,378.19 × 625.78
  4. Step 4: Simplify right side
    997.93x = 862,443.74
  5. Step 5: Solve for x
    x = 862,443.74/997.93
  6. Step 6: Final answer
    x = 864.23

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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.