Home / 20,990.15-28,959.08-11,914.43

Finding the Fourth Proportional to 20,990.15, 28,959.08 and 11,914.43

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Solution

The fourth proportional to 20,990.15, 28,959.08 and 11,914.43 is: 16,437.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.15 : 28,959.08 = 11,914.43 : x
  2. Step 2: Convert to fraction form
    20,990.15/28,959.08 = 11,914.43/x
  3. Step 3: Cross multiply
    20,990.15x = 28,959.08 × 11,914.43
  4. Step 4: Simplify right side
    20,990.15x = 345,030,931.52
  5. Step 5: Solve for x
    x = 345,030,931.52/20,990.15
  6. Step 6: Final answer
    x = 16,437.75

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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.