Home / 20,987.62-28,956.41-11,911.50

Finding the Fourth Proportional to 20,987.62, 28,956.41 and 11,911.50

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Solution

The fourth proportional to 20,987.62, 28,956.41 and 11,911.50 is: 16,434.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.62 : 28,956.41 = 11,911.50 : x
  2. Step 2: Convert to fraction form
    20,987.62/28,956.41 = 11,911.50/x
  3. Step 3: Cross multiply
    20,987.62x = 28,956.41 × 11,911.50
  4. Step 4: Simplify right side
    20,987.62x = 344,914,277.72
  5. Step 5: Solve for x
    x = 344,914,277.72/20,987.62
  6. Step 6: Final answer
    x = 16,434.18

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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.