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Finding the Fourth Proportional to 855.83, 1,282.82 and 611.61

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Solution

The fourth proportional to 855.83, 1,282.82 and 611.61 is: 916.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.83 : 1,282.82 = 611.61 : x
  2. Step 2: Convert to fraction form
    855.83/1,282.82 = 611.61/x
  3. Step 3: Cross multiply
    855.83x = 1,282.82 × 611.61
  4. Step 4: Simplify right side
    855.83x = 784,585.54
  5. Step 5: Solve for x
    x = 784,585.54/855.83
  6. Step 6: Final answer
    x = 916.75

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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.