Home / 20,112.70-27,782.58-15,455.20

Finding the Fourth Proportional to 20,112.70, 27,782.58 and 15,455.20

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Solution

The fourth proportional to 20,112.70, 27,782.58 and 15,455.20 is: 21,348.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,112.70 : 27,782.58 = 15,455.20 : x
  2. Step 2: Convert to fraction form
    20,112.70/27,782.58 = 15,455.20/x
  3. Step 3: Cross multiply
    20,112.70x = 27,782.58 × 15,455.20
  4. Step 4: Simplify right side
    20,112.70x = 429,385,330.42
  5. Step 5: Solve for x
    x = 429,385,330.42/20,112.70
  6. Step 6: Final answer
    x = 21,348.97

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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.