Home / 21,989.01-30,345.20-11,917.77

Finding the Fourth Proportional to 21,989.01, 30,345.20 and 11,917.77

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Solution

The fourth proportional to 21,989.01, 30,345.20 and 11,917.77 is: 16,446.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,989.01 : 30,345.20 = 11,917.77 : x
  2. Step 2: Convert to fraction form
    21,989.01/30,345.20 = 11,917.77/x
  3. Step 3: Cross multiply
    21,989.01x = 30,345.20 × 11,917.77
  4. Step 4: Simplify right side
    21,989.01x = 361,647,114.20
  5. Step 5: Solve for x
    x = 361,647,114.20/21,989.01
  6. Step 6: Final answer
    x = 16,446.72

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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.