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Finding the Fourth Proportional to 1,636.66, 2,255.07 and 1,111.78

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Solution

The fourth proportional to 1,636.66, 2,255.07 and 1,111.78 is: 1,531.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,636.66 : 2,255.07 = 1,111.78 : x
  2. Step 2: Convert to fraction form
    1,636.66/2,255.07 = 1,111.78/x
  3. Step 3: Cross multiply
    1,636.66x = 2,255.07 × 1,111.78
  4. Step 4: Simplify right side
    1,636.66x = 2,507,141.72
  5. Step 5: Solve for x
    x = 2,507,141.72/1,636.66
  6. Step 6: Final answer
    x = 1,531.86

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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.