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Finding the Fourth Proportional to 838.92, 1,257.21 and 400.35

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Solution

The fourth proportional to 838.92, 1,257.21 and 400.35 is: 599.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.92 : 1,257.21 = 400.35 : x
  2. Step 2: Convert to fraction form
    838.92/1,257.21 = 400.35/x
  3. Step 3: Cross multiply
    838.92x = 1,257.21 × 400.35
  4. Step 4: Simplify right side
    838.92x = 503,324.02
  5. Step 5: Solve for x
    x = 503,324.02/838.92
  6. Step 6: Final answer
    x = 599.97

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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.