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Finding the Fourth Proportional to 905.28, 1,357.44 and 392

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Solution

The fourth proportional to 905.28, 1,357.44 and 392 is: 587.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.28 : 1,357.44 = 392 : x
  2. Step 2: Convert to fraction form
    905.28/1,357.44 = 392/x
  3. Step 3: Cross multiply
    905.28x = 1,357.44 × 392
  4. Step 4: Simplify right side
    905.28x = 532,116.48
  5. Step 5: Solve for x
    x = 532,116.48/905.28
  6. Step 6: Final answer
    x = 587.79

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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.