Home / 20,640.52-28,456.31-16,405.64

Finding the Fourth Proportional to 20,640.52, 28,456.31 and 16,405.64

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Solution

The fourth proportional to 20,640.52, 28,456.31 and 16,405.64 is: 22,617.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.52 : 28,456.31 = 16,405.64 : x
  2. Step 2: Convert to fraction form
    20,640.52/28,456.31 = 16,405.64/x
  3. Step 3: Cross multiply
    20,640.52x = 28,456.31 × 16,405.64
  4. Step 4: Simplify right side
    20,640.52x = 466,843,983.03
  5. Step 5: Solve for x
    x = 466,843,983.03/20,640.52
  6. Step 6: Final answer
    x = 22,617.84

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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.