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Finding the Fourth Proportional to 20,874.56, 28,807.14 and 11,442.92

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Solution

The fourth proportional to 20,874.56, 28,807.14 and 11,442.92 is: 15,791.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.56 : 28,807.14 = 11,442.92 : x
  2. Step 2: Convert to fraction form
    20,874.56/28,807.14 = 11,442.92/x
  3. Step 3: Cross multiply
    20,874.56x = 28,807.14 × 11,442.92
  4. Step 4: Simplify right side
    20,874.56x = 329,637,798.45
  5. Step 5: Solve for x
    x = 329,637,798.45/20,874.56
  6. Step 6: Final answer
    x = 15,791.37

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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.