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Finding the Fourth Proportional to 132,990.40, 199,386.40 and 80,388.80

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Solution

The fourth proportional to 132,990.40, 199,386.40 and 80,388.80 is: 120,523.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,990.40 : 199,386.40 = 80,388.80 : x
  2. Step 2: Convert to fraction form
    132,990.40/199,386.40 = 80,388.80/x
  3. Step 3: Cross multiply
    132,990.40x = 199,386.40 × 80,388.80
  4. Step 4: Simplify right side
    132,990.40x = 16,028,433,432.32
  5. Step 5: Solve for x
    x = 16,028,433,432.32/132,990.40
  6. Step 6: Final answer
    x = 120,523.24

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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.