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Finding the Fourth Proportional to 1,638.68, 2,257.80 and 1,113.80

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Solution

The fourth proportional to 1,638.68, 2,257.80 and 1,113.80 is: 1,534.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.68 : 2,257.80 = 1,113.80 : x
  2. Step 2: Convert to fraction form
    1,638.68/2,257.80 = 1,113.80/x
  3. Step 3: Cross multiply
    1,638.68x = 2,257.80 × 1,113.80
  4. Step 4: Simplify right side
    1,638.68x = 2,514,737.64
  5. Step 5: Solve for x
    x = 2,514,737.64/1,638.68
  6. Step 6: Final answer
    x = 1,534.61

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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.