Home / 20,456.80-30,685.20-18,342.70

Finding the Fourth Proportional to 20,456.80, 30,685.20 and 18,342.70

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Solution

The fourth proportional to 20,456.80, 30,685.20 and 18,342.70 is: 27,514.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.80 : 30,685.20 = 18,342.70 : x
  2. Step 2: Convert to fraction form
    20,456.80/30,685.20 = 18,342.70/x
  3. Step 3: Cross multiply
    20,456.80x = 30,685.20 × 18,342.70
  4. Step 4: Simplify right side
    20,456.80x = 562,849,418.04
  5. Step 5: Solve for x
    x = 562,849,418.04/20,456.80
  6. Step 6: Final answer
    x = 27,514.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.