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Finding the Fourth Proportional to 312,121.20, 468,343.80 and 145,909.20

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Solution

The fourth proportional to 312,121.20, 468,343.80 and 145,909.20 is: 218,939.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,121.20 : 468,343.80 = 145,909.20 : x
  2. Step 2: Convert to fraction form
    312,121.20/468,343.80 = 145,909.20/x
  3. Step 3: Cross multiply
    312,121.20x = 468,343.80 × 145,909.20
  4. Step 4: Simplify right side
    312,121.20x = 68,335,669,182.96
  5. Step 5: Solve for x
    x = 68,335,669,182.96/312,121.20
  6. Step 6: Final answer
    x = 218,939.53

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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.