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Finding the Fourth Proportional to 906.72, 1,360.21 and 290.31

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Solution

The fourth proportional to 906.72, 1,360.21 and 290.31 is: 435.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.72 : 1,360.21 = 290.31 : x
  2. Step 2: Convert to fraction form
    906.72/1,360.21 = 290.31/x
  3. Step 3: Cross multiply
    906.72x = 1,360.21 × 290.31
  4. Step 4: Simplify right side
    906.72x = 394,882.57
  5. Step 5: Solve for x
    x = 394,882.57/906.72
  6. Step 6: Final answer
    x = 435.51

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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.