Home / 20,388.95-28,134.50-11,434.61

Finding the Fourth Proportional to 20,388.95, 28,134.50 and 11,434.61

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Solution

The fourth proportional to 20,388.95, 28,134.50 and 11,434.61 is: 15,778.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.95 : 28,134.50 = 11,434.61 : x
  2. Step 2: Convert to fraction form
    20,388.95/28,134.50 = 11,434.61/x
  3. Step 3: Cross multiply
    20,388.95x = 28,134.50 × 11,434.61
  4. Step 4: Simplify right side
    20,388.95x = 321,706,837.20
  5. Step 5: Solve for x
    x = 321,706,837.20/20,388.95
  6. Step 6: Final answer
    x = 15,778.49

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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.