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Finding the Fourth Proportional to 912.36, 1,369.49 and 668.15

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Solution

The fourth proportional to 912.36, 1,369.49 and 668.15 is: 1,002.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.36 : 1,369.49 = 668.15 : x
  2. Step 2: Convert to fraction form
    912.36/1,369.49 = 668.15/x
  3. Step 3: Cross multiply
    912.36x = 1,369.49 × 668.15
  4. Step 4: Simplify right side
    912.36x = 915,014.56
  5. Step 5: Solve for x
    x = 915,014.56/912.36
  6. Step 6: Final answer
    x = 1,002.91

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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.