Home / 20,819.16-28,730.39-11,387.72

Finding the Fourth Proportional to 20,819.16, 28,730.39 and 11,387.72

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Solution

The fourth proportional to 20,819.16, 28,730.39 and 11,387.72 is: 15,715.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.16 : 28,730.39 = 11,387.72 : x
  2. Step 2: Convert to fraction form
    20,819.16/28,730.39 = 11,387.72/x
  3. Step 3: Cross multiply
    20,819.16x = 28,730.39 × 11,387.72
  4. Step 4: Simplify right side
    20,819.16x = 327,173,436.22
  5. Step 5: Solve for x
    x = 327,173,436.22/20,819.16
  6. Step 6: Final answer
    x = 15,715.02

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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.