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Finding the Fourth Proportional to 821.54, 1,232.58 and 388.64

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Solution

The fourth proportional to 821.54, 1,232.58 and 388.64 is: 583.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.54 : 1,232.58 = 388.64 : x
  2. Step 2: Convert to fraction form
    821.54/1,232.58 = 388.64/x
  3. Step 3: Cross multiply
    821.54x = 1,232.58 × 388.64
  4. Step 4: Simplify right side
    821.54x = 479,029.89
  5. Step 5: Solve for x
    x = 479,029.89/821.54
  6. Step 6: Final answer
    x = 583.09

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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.