Home / 20,391.74-28,140.87-11,438.70

Finding the Fourth Proportional to 20,391.74, 28,140.87 and 11,438.70

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Solution

The fourth proportional to 20,391.74, 28,140.87 and 11,438.70 is: 15,785.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.74 : 28,140.87 = 11,438.70 : x
  2. Step 2: Convert to fraction form
    20,391.74/28,140.87 = 11,438.70/x
  3. Step 3: Cross multiply
    20,391.74x = 28,140.87 × 11,438.70
  4. Step 4: Simplify right side
    20,391.74x = 321,894,969.67
  5. Step 5: Solve for x
    x = 321,894,969.67/20,391.74
  6. Step 6: Final answer
    x = 15,785.56

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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.