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Finding the Fourth Proportional to 862.88, 1,285.99 and 861.51

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Solution

The fourth proportional to 862.88, 1,285.99 and 861.51 is: 1,283.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.88 : 1,285.99 = 861.51 : x
  2. Step 2: Convert to fraction form
    862.88/1,285.99 = 861.51/x
  3. Step 3: Cross multiply
    862.88x = 1,285.99 × 861.51
  4. Step 4: Simplify right side
    862.88x = 1,107,890.31
  5. Step 5: Solve for x
    x = 1,107,890.31/862.88
  6. Step 6: Final answer
    x = 1,283.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.