Home / 20,398.40-30,561.12-12,378.56

Finding the Fourth Proportional to 20,398.40, 30,561.12 and 12,378.56

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Solution

The fourth proportional to 20,398.40, 30,561.12 and 12,378.56 is: 18,545.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,398.40 : 30,561.12 = 12,378.56 : x
  2. Step 2: Convert to fraction form
    20,398.40/30,561.12 = 12,378.56/x
  3. Step 3: Cross multiply
    20,398.40x = 30,561.12 × 12,378.56
  4. Step 4: Simplify right side
    20,398.40x = 378,302,657.59
  5. Step 5: Solve for x
    x = 378,302,657.59/20,398.40
  6. Step 6: Final answer
    x = 18,545.70

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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.