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Finding the Fourth Proportional to 39,892.96, 55,049.80 and 21,988.11

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Solution

The fourth proportional to 39,892.96, 55,049.80 and 21,988.11 is: 30,342.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,892.96 : 55,049.80 = 21,988.11 : x
  2. Step 2: Convert to fraction form
    39,892.96/55,049.80 = 21,988.11/x
  3. Step 3: Cross multiply
    39,892.96x = 55,049.80 × 21,988.11
  4. Step 4: Simplify right side
    39,892.96x = 1,210,441,057.88
  5. Step 5: Solve for x
    x = 1,210,441,057.88/39,892.96
  6. Step 6: Final answer
    x = 30,342.22

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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.