Home / 20,380.48-28,124.72-11,428.32

Finding the Fourth Proportional to 20,380.48, 28,124.72 and 11,428.32

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Solution

The fourth proportional to 20,380.48, 28,124.72 and 11,428.32 is: 15,770.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.48 : 28,124.72 = 11,428.32 : x
  2. Step 2: Convert to fraction form
    20,380.48/28,124.72 = 11,428.32/x
  3. Step 3: Cross multiply
    20,380.48x = 28,124.72 × 11,428.32
  4. Step 4: Simplify right side
    20,380.48x = 321,418,300.07
  5. Step 5: Solve for x
    x = 321,418,300.07/20,380.48
  6. Step 6: Final answer
    x = 15,770.89

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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.