Home / 20,371.13-28,111.77-11,419.40

Finding the Fourth Proportional to 20,371.13, 28,111.77 and 11,419.40

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Solution

The fourth proportional to 20,371.13, 28,111.77 and 11,419.40 is: 15,758.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,371.13 : 28,111.77 = 11,419.40 : x
  2. Step 2: Convert to fraction form
    20,371.13/28,111.77 = 11,419.40/x
  3. Step 3: Cross multiply
    20,371.13x = 28,111.77 × 11,419.40
  4. Step 4: Simplify right side
    20,371.13x = 321,019,546.34
  5. Step 5: Solve for x
    x = 321,019,546.34/20,371.13
  6. Step 6: Final answer
    x = 15,758.55

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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.