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Finding the Fourth Proportional to 836.19, 1,161.20 and 828.09

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Solution

The fourth proportional to 836.19, 1,161.20 and 828.09 is: 1,149.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.19 : 1,161.20 = 828.09 : x
  2. Step 2: Convert to fraction form
    836.19/1,161.20 = 828.09/x
  3. Step 3: Cross multiply
    836.19x = 1,161.20 × 828.09
  4. Step 4: Simplify right side
    836.19x = 961,580.18
  5. Step 5: Solve for x
    x = 961,580.18/836.19
  6. Step 6: Final answer
    x = 1,149.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.