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Finding the Fourth Proportional to 29,581.20, 40,806.72 and 20,021.40

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Solution

The fourth proportional to 29,581.20, 40,806.72 and 20,021.40 is: 27,619.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,581.20 : 40,806.72 = 20,021.40 : x
  2. Step 2: Convert to fraction form
    29,581.20/40,806.72 = 20,021.40/x
  3. Step 3: Cross multiply
    29,581.20x = 40,806.72 × 20,021.40
  4. Step 4: Simplify right side
    29,581.20x = 817,007,663.81
  5. Step 5: Solve for x
    x = 817,007,663.81/29,581.20
  6. Step 6: Final answer
    x = 27,619.15

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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.