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Finding the Fourth Proportional to 1,625.73, 2,439 and 638.61

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Solution

The fourth proportional to 1,625.73, 2,439 and 638.61 is: 958.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,625.73 : 2,439 = 638.61 : x
  2. Step 2: Convert to fraction form
    1,625.73/2,439 = 638.61/x
  3. Step 3: Cross multiply
    1,625.73x = 2,439 × 638.61
  4. Step 4: Simplify right side
    1,625.73x = 1,557,569.79
  5. Step 5: Solve for x
    x = 1,557,569.79/1,625.73
  6. Step 6: Final answer
    x = 958.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.