Home / 20,378.68-28,128.58-13,306.20

Finding the Fourth Proportional to 20,378.68, 28,128.58 and 13,306.20

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Solution

The fourth proportional to 20,378.68, 28,128.58 and 13,306.20 is: 18,366.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.68 : 28,128.58 = 13,306.20 : x
  2. Step 2: Convert to fraction form
    20,378.68/28,128.58 = 13,306.20/x
  3. Step 3: Cross multiply
    20,378.68x = 28,128.58 × 13,306.20
  4. Step 4: Simplify right side
    20,378.68x = 374,284,511.20
  5. Step 5: Solve for x
    x = 374,284,511.20/20,378.68
  6. Step 6: Final answer
    x = 18,366.47

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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.