Home / 20,385.32-28,108.94-12,822.39

Finding the Fourth Proportional to 20,385.32, 28,108.94 and 12,822.39

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Solution

The fourth proportional to 20,385.32, 28,108.94 and 12,822.39 is: 17,680.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.32 : 28,108.94 = 12,822.39 : x
  2. Step 2: Convert to fraction form
    20,385.32/28,108.94 = 12,822.39/x
  3. Step 3: Cross multiply
    20,385.32x = 28,108.94 × 12,822.39
  4. Step 4: Simplify right side
    20,385.32x = 360,423,727.05
  5. Step 5: Solve for x
    x = 360,423,727.05/20,385.32
  6. Step 6: Final answer
    x = 17,680.56

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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.