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Finding the Fourth Proportional to 1,285.61, 1,772.51 and 842.75

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Solution

The fourth proportional to 1,285.61, 1,772.51 and 842.75 is: 1,161.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.61 : 1,772.51 = 842.75 : x
  2. Step 2: Convert to fraction form
    1,285.61/1,772.51 = 842.75/x
  3. Step 3: Cross multiply
    1,285.61x = 1,772.51 × 842.75
  4. Step 4: Simplify right side
    1,285.61x = 1,493,769.73
  5. Step 5: Solve for x
    x = 1,493,769.73/1,285.61
  6. Step 6: Final answer
    x = 1,161.91

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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.