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Finding the Fourth Proportional to 821.25, 1,232.48 and 388.71

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Solution

The fourth proportional to 821.25, 1,232.48 and 388.71 is: 583.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.25 : 1,232.48 = 388.71 : x
  2. Step 2: Convert to fraction form
    821.25/1,232.48 = 388.71/x
  3. Step 3: Cross multiply
    821.25x = 1,232.48 × 388.71
  4. Step 4: Simplify right side
    821.25x = 479,077.30
  5. Step 5: Solve for x
    x = 479,077.30/821.25
  6. Step 6: Final answer
    x = 583.35

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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.