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Finding the Fourth Proportional to 1,284.26, 1,772.82 and 818.54

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Solution

The fourth proportional to 1,284.26, 1,772.82 and 818.54 is: 1,129.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.26 : 1,772.82 = 818.54 : x
  2. Step 2: Convert to fraction form
    1,284.26/1,772.82 = 818.54/x
  3. Step 3: Cross multiply
    1,284.26x = 1,772.82 × 818.54
  4. Step 4: Simplify right side
    1,284.26x = 1,451,124.08
  5. Step 5: Solve for x
    x = 1,451,124.08/1,284.26
  6. Step 6: Final answer
    x = 1,129.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.