Home / 20,855.30-28,780.45-11,295.18

Finding the Fourth Proportional to 20,855.30, 28,780.45 and 11,295.18

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Solution

The fourth proportional to 20,855.30, 28,780.45 and 11,295.18 is: 15,587.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.30 : 28,780.45 = 11,295.18 : x
  2. Step 2: Convert to fraction form
    20,855.30/28,780.45 = 11,295.18/x
  3. Step 3: Cross multiply
    20,855.30x = 28,780.45 × 11,295.18
  4. Step 4: Simplify right side
    20,855.30x = 325,080,334.99
  5. Step 5: Solve for x
    x = 325,080,334.99/20,855.30
  6. Step 6: Final answer
    x = 15,587.42

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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.