Home / 20,380.50-28,124.69-11,428.79

Finding the Fourth Proportional to 20,380.50, 28,124.69 and 11,428.79

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Solution

The fourth proportional to 20,380.50, 28,124.69 and 11,428.79 is: 15,771.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.50 : 28,124.69 = 11,428.79 : x
  2. Step 2: Convert to fraction form
    20,380.50/28,124.69 = 11,428.79/x
  3. Step 3: Cross multiply
    20,380.50x = 28,124.69 × 11,428.79
  4. Step 4: Simplify right side
    20,380.50x = 321,430,978.06
  5. Step 5: Solve for x
    x = 321,430,978.06/20,380.50
  6. Step 6: Final answer
    x = 15,771.50

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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.