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Finding the Fourth Proportional to 1,638.58, 2,261.46 and 940

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Solution

The fourth proportional to 1,638.58, 2,261.46 and 940 is: 1,297.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.58 : 2,261.46 = 940 : x
  2. Step 2: Convert to fraction form
    1,638.58/2,261.46 = 940/x
  3. Step 3: Cross multiply
    1,638.58x = 2,261.46 × 940
  4. Step 4: Simplify right side
    1,638.58x = 2,125,772.40
  5. Step 5: Solve for x
    x = 2,125,772.40/1,638.58
  6. Step 6: Final answer
    x = 1,297.33

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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.