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Finding the Fourth Proportional to 40,991.20, 61,486.80 and 13,289.20

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Solution

The fourth proportional to 40,991.20, 61,486.80 and 13,289.20 is: 19,933.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,991.20 : 61,486.80 = 13,289.20 : x
  2. Step 2: Convert to fraction form
    40,991.20/61,486.80 = 13,289.20/x
  3. Step 3: Cross multiply
    40,991.20x = 61,486.80 × 13,289.20
  4. Step 4: Simplify right side
    40,991.20x = 817,110,382.56
  5. Step 5: Solve for x
    x = 817,110,382.56/40,991.20
  6. Step 6: Final answer
    x = 19,933.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.