Home / 20,665.20-28,518.09-12,167.69

Finding the Fourth Proportional to 20,665.20, 28,518.09 and 12,167.69

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Solution

The fourth proportional to 20,665.20, 28,518.09 and 12,167.69 is: 16,791.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.20 : 28,518.09 = 12,167.69 : x
  2. Step 2: Convert to fraction form
    20,665.20/28,518.09 = 12,167.69/x
  3. Step 3: Cross multiply
    20,665.20x = 28,518.09 × 12,167.69
  4. Step 4: Simplify right side
    20,665.20x = 346,999,278.51
  5. Step 5: Solve for x
    x = 346,999,278.51/20,665.20
  6. Step 6: Final answer
    x = 16,791.48

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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.