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Finding the Fourth Proportional to 912.79, 1,369.18 and 868.52

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Solution

The fourth proportional to 912.79, 1,369.18 and 868.52 is: 1,302.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.79 : 1,369.18 = 868.52 : x
  2. Step 2: Convert to fraction form
    912.79/1,369.18 = 868.52/x
  3. Step 3: Cross multiply
    912.79x = 1,369.18 × 868.52
  4. Step 4: Simplify right side
    912.79x = 1,189,164.72
  5. Step 5: Solve for x
    x = 1,189,164.72/912.79
  6. Step 6: Final answer
    x = 1,302.78

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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.