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Finding the Fourth Proportional to 1,381.22, 1,906.36 and 908.28

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Solution

The fourth proportional to 1,381.22, 1,906.36 and 908.28 is: 1,253.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.22 : 1,906.36 = 908.28 : x
  2. Step 2: Convert to fraction form
    1,381.22/1,906.36 = 908.28/x
  3. Step 3: Cross multiply
    1,381.22x = 1,906.36 × 908.28
  4. Step 4: Simplify right side
    1,381.22x = 1,731,508.66
  5. Step 5: Solve for x
    x = 1,731,508.66/1,381.22
  6. Step 6: Final answer
    x = 1,253.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.