Home / 20,340.88-28,070.11-11,388.37

Finding the Fourth Proportional to 20,340.88, 28,070.11 and 11,388.37

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Solution

The fourth proportional to 20,340.88, 28,070.11 and 11,388.37 is: 15,715.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,340.88 : 28,070.11 = 11,388.37 : x
  2. Step 2: Convert to fraction form
    20,340.88/28,070.11 = 11,388.37/x
  3. Step 3: Cross multiply
    20,340.88x = 28,070.11 × 11,388.37
  4. Step 4: Simplify right side
    20,340.88x = 319,672,798.62
  5. Step 5: Solve for x
    x = 319,672,798.62/20,340.88
  6. Step 6: Final answer
    x = 15,715.78

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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.