Home / 20,391.61-28,150.31-13,674.78

Finding the Fourth Proportional to 20,391.61, 28,150.31 and 13,674.78

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Solution

The fourth proportional to 20,391.61, 28,150.31 and 13,674.78 is: 18,877.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.61 : 28,150.31 = 13,674.78 : x
  2. Step 2: Convert to fraction form
    20,391.61/28,150.31 = 13,674.78/x
  3. Step 3: Cross multiply
    20,391.61x = 28,150.31 × 13,674.78
  4. Step 4: Simplify right side
    20,391.61x = 384,949,296.18
  5. Step 5: Solve for x
    x = 384,949,296.18/20,391.61
  6. Step 6: Final answer
    x = 18,877.83

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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.