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Finding the Fourth Proportional to 1,381.09, 1,906.20 and 883.66

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Solution

The fourth proportional to 1,381.09, 1,906.20 and 883.66 is: 1,219.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.09 : 1,906.20 = 883.66 : x
  2. Step 2: Convert to fraction form
    1,381.09/1,906.20 = 883.66/x
  3. Step 3: Cross multiply
    1,381.09x = 1,906.20 × 883.66
  4. Step 4: Simplify right side
    1,381.09x = 1,684,432.69
  5. Step 5: Solve for x
    x = 1,684,432.69/1,381.09
  6. Step 6: Final answer
    x = 1,219.64

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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.