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Finding the Fourth Proportional to 821.88, 1,232.10 and 388.71

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Solution

The fourth proportional to 821.88, 1,232.10 and 388.71 is: 582.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.88 : 1,232.10 = 388.71 : x
  2. Step 2: Convert to fraction form
    821.88/1,232.10 = 388.71/x
  3. Step 3: Cross multiply
    821.88x = 1,232.10 × 388.71
  4. Step 4: Simplify right side
    821.88x = 478,929.59
  5. Step 5: Solve for x
    x = 478,929.59/821.88
  6. Step 6: Final answer
    x = 582.72

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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.