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Finding the Fourth Proportional to 839.14, 1,257.77 and 448.74

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Solution

The fourth proportional to 839.14, 1,257.77 and 448.74 is: 672.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.14 : 1,257.77 = 448.74 : x
  2. Step 2: Convert to fraction form
    839.14/1,257.77 = 448.74/x
  3. Step 3: Cross multiply
    839.14x = 1,257.77 × 448.74
  4. Step 4: Simplify right side
    839.14x = 564,412.83
  5. Step 5: Solve for x
    x = 564,412.83/839.14
  6. Step 6: Final answer
    x = 672.61

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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.