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Finding the Fourth Proportional to 21,813.57, 30,101.91 and 13,329.88

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Solution

The fourth proportional to 21,813.57, 30,101.91 and 13,329.88 is: 18,394.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,813.57 : 30,101.91 = 13,329.88 : x
  2. Step 2: Convert to fraction form
    21,813.57/30,101.91 = 13,329.88/x
  3. Step 3: Cross multiply
    21,813.57x = 30,101.91 × 13,329.88
  4. Step 4: Simplify right side
    21,813.57x = 401,254,722.83
  5. Step 5: Solve for x
    x = 401,254,722.83/21,813.57
  6. Step 6: Final answer
    x = 18,394.73

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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.