Home / 20,981.34-28,891.80-20,515.68

Finding the Fourth Proportional to 20,981.34, 28,891.80 and 20,515.68

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Solution

The fourth proportional to 20,981.34, 28,891.80 and 20,515.68 is: 28,250.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.34 : 28,891.80 = 20,515.68 : x
  2. Step 2: Convert to fraction form
    20,981.34/28,891.80 = 20,515.68/x
  3. Step 3: Cross multiply
    20,981.34x = 28,891.80 × 20,515.68
  4. Step 4: Simplify right side
    20,981.34x = 592,734,923.42
  5. Step 5: Solve for x
    x = 592,734,923.42/20,981.34
  6. Step 6: Final answer
    x = 28,250.58

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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.