Home / 20,881.14-28,816.20-11,449.50

Finding the Fourth Proportional to 20,881.14, 28,816.20 and 11,449.50

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Solution

The fourth proportional to 20,881.14, 28,816.20 and 11,449.50 is: 15,800.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.14 : 28,816.20 = 11,449.50 : x
  2. Step 2: Convert to fraction form
    20,881.14/28,816.20 = 11,449.50/x
  3. Step 3: Cross multiply
    20,881.14x = 28,816.20 × 11,449.50
  4. Step 4: Simplify right side
    20,881.14x = 329,931,081.90
  5. Step 5: Solve for x
    x = 329,931,081.90/20,881.14
  6. Step 6: Final answer
    x = 15,800.43

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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.