Home / 20,911.32-28,857.72-11,479.88

Finding the Fourth Proportional to 20,911.32, 28,857.72 and 11,479.88

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Solution

The fourth proportional to 20,911.32, 28,857.72 and 11,479.88 is: 15,842.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.32 : 28,857.72 = 11,479.88 : x
  2. Step 2: Convert to fraction form
    20,911.32/28,857.72 = 11,479.88/x
  3. Step 3: Cross multiply
    20,911.32x = 28,857.72 × 11,479.88
  4. Step 4: Simplify right side
    20,911.32x = 331,283,018.39
  5. Step 5: Solve for x
    x = 331,283,018.39/20,911.32
  6. Step 6: Final answer
    x = 15,842.28

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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.