Home / 20,987.42-28,959.57-11,911.37

Finding the Fourth Proportional to 20,987.42, 28,959.57 and 11,911.37

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Solution

The fourth proportional to 20,987.42, 28,959.57 and 11,911.37 is: 16,435.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.42 : 28,959.57 = 11,911.37 : x
  2. Step 2: Convert to fraction form
    20,987.42/28,959.57 = 11,911.37/x
  3. Step 3: Cross multiply
    20,987.42x = 28,959.57 × 11,911.37
  4. Step 4: Simplify right side
    20,987.42x = 344,948,008.51
  5. Step 5: Solve for x
    x = 344,948,008.51/20,987.42
  6. Step 6: Final answer
    x = 16,435.95

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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.