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Finding the Fourth Proportional to 862.36, 1,287.77 and 677.68

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Solution

The fourth proportional to 862.36, 1,287.77 and 677.68 is: 1,011.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.36 : 1,287.77 = 677.68 : x
  2. Step 2: Convert to fraction form
    862.36/1,287.77 = 677.68/x
  3. Step 3: Cross multiply
    862.36x = 1,287.77 × 677.68
  4. Step 4: Simplify right side
    862.36x = 872,695.97
  5. Step 5: Solve for x
    x = 872,695.97/862.36
  6. Step 6: Final answer
    x = 1,011.99

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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.