Home / 20,861.67-28,787.90-11,428.59

Finding the Fourth Proportional to 20,861.67, 28,787.90 and 11,428.59

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Solution

The fourth proportional to 20,861.67, 28,787.90 and 11,428.59 is: 15,770.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.67 : 28,787.90 = 11,428.59 : x
  2. Step 2: Convert to fraction form
    20,861.67/28,787.90 = 11,428.59/x
  3. Step 3: Cross multiply
    20,861.67x = 28,787.90 × 11,428.59
  4. Step 4: Simplify right side
    20,861.67x = 329,005,048.92
  5. Step 5: Solve for x
    x = 329,005,048.92/20,861.67
  6. Step 6: Final answer
    x = 15,770.79

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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.