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Finding the Fourth Proportional to 260,820.80, 391,490.40 and 127,851.20

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Solution

The fourth proportional to 260,820.80, 391,490.40 and 127,851.20 is: 191,903.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,820.80 : 391,490.40 = 127,851.20 : x
  2. Step 2: Convert to fraction form
    260,820.80/391,490.40 = 127,851.20/x
  3. Step 3: Cross multiply
    260,820.80x = 391,490.40 × 127,851.20
  4. Step 4: Simplify right side
    260,820.80x = 50,052,517,428.48
  5. Step 5: Solve for x
    x = 50,052,517,428.48/260,820.80
  6. Step 6: Final answer
    x = 191,903.86

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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.