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Finding the Fourth Proportional to 912.47, 1,369.31 and 752.09

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Solution

The fourth proportional to 912.47, 1,369.31 and 752.09 is: 1,128.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.47 : 1,369.31 = 752.09 : x
  2. Step 2: Convert to fraction form
    912.47/1,369.31 = 752.09/x
  3. Step 3: Cross multiply
    912.47x = 1,369.31 × 752.09
  4. Step 4: Simplify right side
    912.47x = 1,029,833.75
  5. Step 5: Solve for x
    x = 1,029,833.75/912.47
  6. Step 6: Final answer
    x = 1,128.63

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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.