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Finding the Fourth Proportional to 21,988.41, 30,343.95 and 11,917.11

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Solution

The fourth proportional to 21,988.41, 30,343.95 and 11,917.11 is: 16,445.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.41 : 30,343.95 = 11,917.11 : x
  2. Step 2: Convert to fraction form
    21,988.41/30,343.95 = 11,917.11/x
  3. Step 3: Cross multiply
    21,988.41x = 30,343.95 × 11,917.11
  4. Step 4: Simplify right side
    21,988.41x = 361,612,189.98
  5. Step 5: Solve for x
    x = 361,612,189.98/21,988.41
  6. Step 6: Final answer
    x = 16,445.58

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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.