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Finding the Fourth Proportional to 1,638.68, 2,261.30 and 940.04

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Solution

The fourth proportional to 1,638.68, 2,261.30 and 940.04 is: 1,297.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.68 : 2,261.30 = 940.04 : x
  2. Step 2: Convert to fraction form
    1,638.68/2,261.30 = 940.04/x
  3. Step 3: Cross multiply
    1,638.68x = 2,261.30 × 940.04
  4. Step 4: Simplify right side
    1,638.68x = 2,125,712.45
  5. Step 5: Solve for x
    x = 2,125,712.45/1,638.68
  6. Step 6: Final answer
    x = 1,297.21

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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.