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Finding the Fourth Proportional to 912.48, 1,367.40 and 669

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Solution

The fourth proportional to 912.48, 1,367.40 and 669 is: 1,002.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.48 : 1,367.40 = 669 : x
  2. Step 2: Convert to fraction form
    912.48/1,367.40 = 669/x
  3. Step 3: Cross multiply
    912.48x = 1,367.40 × 669
  4. Step 4: Simplify right side
    912.48x = 914,790.60
  5. Step 5: Solve for x
    x = 914,790.60/912.48
  6. Step 6: Final answer
    x = 1,002.53

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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.