Home / 20,935.20-28,890.69-11,375.16

Finding the Fourth Proportional to 20,935.20, 28,890.69 and 11,375.16

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Solution

The fourth proportional to 20,935.20, 28,890.69 and 11,375.16 is: 15,697.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,935.20 : 28,890.69 = 11,375.16 : x
  2. Step 2: Convert to fraction form
    20,935.20/28,890.69 = 11,375.16/x
  3. Step 3: Cross multiply
    20,935.20x = 28,890.69 × 11,375.16
  4. Step 4: Simplify right side
    20,935.20x = 328,636,221.26
  5. Step 5: Solve for x
    x = 328,636,221.26/20,935.20
  6. Step 6: Final answer
    x = 15,697.78

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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.