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Finding the Fourth Proportional to 838.95, 1,257.76 and 399.97

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Solution

The fourth proportional to 838.95, 1,257.76 and 399.97 is: 599.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.95 : 1,257.76 = 399.97 : x
  2. Step 2: Convert to fraction form
    838.95/1,257.76 = 399.97/x
  3. Step 3: Cross multiply
    838.95x = 1,257.76 × 399.97
  4. Step 4: Simplify right side
    838.95x = 503,066.27
  5. Step 5: Solve for x
    x = 503,066.27/838.95
  6. Step 6: Final answer
    x = 599.64

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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.