Home / 20,880.60-28,815.30-11,449.20

Finding the Fourth Proportional to 20,880.60, 28,815.30 and 11,449.20

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Solution

The fourth proportional to 20,880.60, 28,815.30 and 11,449.20 is: 15,799.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.60 : 28,815.30 = 11,449.20 : x
  2. Step 2: Convert to fraction form
    20,880.60/28,815.30 = 11,449.20/x
  3. Step 3: Cross multiply
    20,880.60x = 28,815.30 × 11,449.20
  4. Step 4: Simplify right side
    20,880.60x = 329,912,132.76
  5. Step 5: Solve for x
    x = 329,912,132.76/20,880.60
  6. Step 6: Final answer
    x = 15,799.94

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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.