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Finding the Fourth Proportional to 836.88, 1,255.52 and 259.75

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Solution

The fourth proportional to 836.88, 1,255.52 and 259.75 is: 389.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.88 : 1,255.52 = 259.75 : x
  2. Step 2: Convert to fraction form
    836.88/1,255.52 = 259.75/x
  3. Step 3: Cross multiply
    836.88x = 1,255.52 × 259.75
  4. Step 4: Simplify right side
    836.88x = 326,121.32
  5. Step 5: Solve for x
    x = 326,121.32/836.88
  6. Step 6: Final answer
    x = 389.69

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Double scale
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Similar ratio
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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.