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Finding the Fourth Proportional to 1,208.88, 1,813.03 and 387

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Solution

The fourth proportional to 1,208.88, 1,813.03 and 387 is: 580.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.88 : 1,813.03 = 387 : x
  2. Step 2: Convert to fraction form
    1,208.88/1,813.03 = 387/x
  3. Step 3: Cross multiply
    1,208.88x = 1,813.03 × 387
  4. Step 4: Simplify right side
    1,208.88x = 701,642.61
  5. Step 5: Solve for x
    x = 701,642.61/1,208.88
  6. Step 6: Final answer
    x = 580.41

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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.