Home / 20,391.68-28,140.16-11,439.20

Finding the Fourth Proportional to 20,391.68, 28,140.16 and 11,439.20

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Solution

The fourth proportional to 20,391.68, 28,140.16 and 11,439.20 is: 15,785.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.68 : 28,140.16 = 11,439.20 : x
  2. Step 2: Convert to fraction form
    20,391.68/28,140.16 = 11,439.20/x
  3. Step 3: Cross multiply
    20,391.68x = 28,140.16 × 11,439.20
  4. Step 4: Simplify right side
    20,391.68x = 321,900,918.27
  5. Step 5: Solve for x
    x = 321,900,918.27/20,391.68
  6. Step 6: Final answer
    x = 15,785.89

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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.