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Finding the Fourth Proportional to 299,871.20, 449,806.80 and 78,255.20

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Solution

The fourth proportional to 299,871.20, 449,806.80 and 78,255.20 is: 117,382.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,871.20 : 449,806.80 = 78,255.20 : x
  2. Step 2: Convert to fraction form
    299,871.20/449,806.80 = 78,255.20/x
  3. Step 3: Cross multiply
    299,871.20x = 449,806.80 × 78,255.20
  4. Step 4: Simplify right side
    299,871.20x = 35,199,721,095.36
  5. Step 5: Solve for x
    x = 35,199,721,095.36/299,871.20
  6. Step 6: Final answer
    x = 117,382.80

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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.