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Finding the Fourth Proportional to 860.74, 1,288.94 and 679.12

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Solution

The fourth proportional to 860.74, 1,288.94 and 679.12 is: 1,016.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.74 : 1,288.94 = 679.12 : x
  2. Step 2: Convert to fraction form
    860.74/1,288.94 = 679.12/x
  3. Step 3: Cross multiply
    860.74x = 1,288.94 × 679.12
  4. Step 4: Simplify right side
    860.74x = 875,338.49
  5. Step 5: Solve for x
    x = 875,338.49/860.74
  6. Step 6: Final answer
    x = 1,016.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.