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Finding the Fourth Proportional to 821.49, 1,232.24 and 388.95

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Solution

The fourth proportional to 821.49, 1,232.24 and 388.95 is: 583.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.49 : 1,232.24 = 388.95 : x
  2. Step 2: Convert to fraction form
    821.49/1,232.24 = 388.95/x
  3. Step 3: Cross multiply
    821.49x = 1,232.24 × 388.95
  4. Step 4: Simplify right side
    821.49x = 479,277.80
  5. Step 5: Solve for x
    x = 479,277.80/821.49
  6. Step 6: Final answer
    x = 583.43

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Double scale
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1.5x scale

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.