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Finding the Fourth Proportional to 1,283.80, 1,771.17 and 841.95

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Solution

The fourth proportional to 1,283.80, 1,771.17 and 841.95 is: 1,161.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.80 : 1,771.17 = 841.95 : x
  2. Step 2: Convert to fraction form
    1,283.80/1,771.17 = 841.95/x
  3. Step 3: Cross multiply
    1,283.80x = 1,771.17 × 841.95
  4. Step 4: Simplify right side
    1,283.80x = 1,491,227.73
  5. Step 5: Solve for x
    x = 1,491,227.73/1,283.80
  6. Step 6: Final answer
    x = 1,161.57

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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.