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Finding the Fourth Proportional to 839.75, 1,259.48 and 254.61

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Solution

The fourth proportional to 839.75, 1,259.48 and 254.61 is: 381.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.75 : 1,259.48 = 254.61 : x
  2. Step 2: Convert to fraction form
    839.75/1,259.48 = 254.61/x
  3. Step 3: Cross multiply
    839.75x = 1,259.48 × 254.61
  4. Step 4: Simplify right side
    839.75x = 320,678.57
  5. Step 5: Solve for x
    x = 320,678.57/839.75
  6. Step 6: Final answer
    x = 381.87

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Double scale
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1.5x scale

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.