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Finding the Fourth Proportional to 836.64, 1,255.20 and 259.56

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Solution

The fourth proportional to 836.64, 1,255.20 and 259.56 is: 389.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.64 : 1,255.20 = 259.56 : x
  2. Step 2: Convert to fraction form
    836.64/1,255.20 = 259.56/x
  3. Step 3: Cross multiply
    836.64x = 1,255.20 × 259.56
  4. Step 4: Simplify right side
    836.64x = 325,799.71
  5. Step 5: Solve for x
    x = 325,799.71/836.64
  6. Step 6: Final answer
    x = 389.41

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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.