Home / 20,788.58-28,678.46-15,120.88

Finding the Fourth Proportional to 20,788.58, 28,678.46 and 15,120.88

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Solution

The fourth proportional to 20,788.58, 28,678.46 and 15,120.88 is: 20,859.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,788.58 : 28,678.46 = 15,120.88 : x
  2. Step 2: Convert to fraction form
    20,788.58/28,678.46 = 15,120.88/x
  3. Step 3: Cross multiply
    20,788.58x = 28,678.46 × 15,120.88
  4. Step 4: Simplify right side
    20,788.58x = 433,643,404.94
  5. Step 5: Solve for x
    x = 433,643,404.94/20,788.58
  6. Step 6: Final answer
    x = 20,859.69

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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.