Home / 20,819.30-28,730.40-11,387.75

Finding the Fourth Proportional to 20,819.30, 28,730.40 and 11,387.75

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Solution

The fourth proportional to 20,819.30, 28,730.40 and 11,387.75 is: 15,714.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.30 : 28,730.40 = 11,387.75 : x
  2. Step 2: Convert to fraction form
    20,819.30/28,730.40 = 11,387.75/x
  3. Step 3: Cross multiply
    20,819.30x = 28,730.40 × 11,387.75
  4. Step 4: Simplify right side
    20,819.30x = 327,174,612.60
  5. Step 5: Solve for x
    x = 327,174,612.60/20,819.30
  6. Step 6: Final answer
    x = 15,714.97

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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.