Home / 20,987.87-28,963.26-11,556.43

Finding the Fourth Proportional to 20,987.87, 28,963.26 and 11,556.43

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Solution

The fourth proportional to 20,987.87, 28,963.26 and 11,556.43 is: 15,947.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.87 : 28,963.26 = 11,556.43 : x
  2. Step 2: Convert to fraction form
    20,987.87/28,963.26 = 11,556.43/x
  3. Step 3: Cross multiply
    20,987.87x = 28,963.26 × 11,556.43
  4. Step 4: Simplify right side
    20,987.87x = 334,711,814.35
  5. Step 5: Solve for x
    x = 334,711,814.35/20,987.87
  6. Step 6: Final answer
    x = 15,947.87

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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.