Home / 1,638.39-2,261.21-939.77

Finding the Fourth Proportional to 1,638.39, 2,261.21 and 939.77

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Solution

The fourth proportional to 1,638.39, 2,261.21 and 939.77 is: 1,297.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.39 : 2,261.21 = 939.77 : x
  2. Step 2: Convert to fraction form
    1,638.39/2,261.21 = 939.77/x
  3. Step 3: Cross multiply
    1,638.39x = 2,261.21 × 939.77
  4. Step 4: Simplify right side
    1,638.39x = 2,125,017.32
  5. Step 5: Solve for x
    x = 2,125,017.32/1,638.39
  6. Step 6: Final answer
    x = 1,297.02

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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.