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Finding the Fourth Proportional to 20,281.80, 27,992.10 and 11,898.30

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Solution

The fourth proportional to 20,281.80, 27,992.10 and 11,898.30 is: 16,421.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,281.80 : 27,992.10 = 11,898.30 : x
  2. Step 2: Convert to fraction form
    20,281.80/27,992.10 = 11,898.30/x
  3. Step 3: Cross multiply
    20,281.80x = 27,992.10 × 11,898.30
  4. Step 4: Simplify right side
    20,281.80x = 333,058,403.43
  5. Step 5: Solve for x
    x = 333,058,403.43/20,281.80
  6. Step 6: Final answer
    x = 16,421.54

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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.