Home / 20,376.78-28,123.11-11,427.90

Finding the Fourth Proportional to 20,376.78, 28,123.11 and 11,427.90

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Solution

The fourth proportional to 20,376.78, 28,123.11 and 11,427.90 is: 15,772.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,376.78 : 28,123.11 = 11,427.90 : x
  2. Step 2: Convert to fraction form
    20,376.78/28,123.11 = 11,427.90/x
  3. Step 3: Cross multiply
    20,376.78x = 28,123.11 × 11,427.90
  4. Step 4: Simplify right side
    20,376.78x = 321,388,088.77
  5. Step 5: Solve for x
    x = 321,388,088.77/20,376.78
  6. Step 6: Final answer
    x = 15,772.27

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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.