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Finding the Fourth Proportional to 912.27, 1,365.57 and 679.80

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Solution

The fourth proportional to 912.27, 1,365.57 and 679.80 is: 1,017.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.27 : 1,365.57 = 679.80 : x
  2. Step 2: Convert to fraction form
    912.27/1,365.57 = 679.80/x
  3. Step 3: Cross multiply
    912.27x = 1,365.57 × 679.80
  4. Step 4: Simplify right side
    912.27x = 928,314.49
  5. Step 5: Solve for x
    x = 928,314.49/912.27
  6. Step 6: Final answer
    x = 1,017.59

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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.