Home / 1,638.27-2,261.07-939.63

Finding the Fourth Proportional to 1,638.27, 2,261.07 and 939.63

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Solution

The fourth proportional to 1,638.27, 2,261.07 and 939.63 is: 1,296.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.27 : 2,261.07 = 939.63 : x
  2. Step 2: Convert to fraction form
    1,638.27/2,261.07 = 939.63/x
  3. Step 3: Cross multiply
    1,638.27x = 2,261.07 × 939.63
  4. Step 4: Simplify right side
    1,638.27x = 2,124,569.20
  5. Step 5: Solve for x
    x = 2,124,569.20/1,638.27
  6. Step 6: Final answer
    x = 1,296.84

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1.5x scale

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.