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Finding the Fourth Proportional to 834.94, 1,252.61 and 257.81

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Solution

The fourth proportional to 834.94, 1,252.61 and 257.81 is: 386.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.94 : 1,252.61 = 257.81 : x
  2. Step 2: Convert to fraction form
    834.94/1,252.61 = 257.81/x
  3. Step 3: Cross multiply
    834.94x = 1,252.61 × 257.81
  4. Step 4: Simplify right side
    834.94x = 322,939.16
  5. Step 5: Solve for x
    x = 322,939.16/834.94
  6. Step 6: Final answer
    x = 386.78

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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.