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Finding the Fourth Proportional to 312,117.20, 468,337.80 and 145,905.20

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Solution

The fourth proportional to 312,117.20, 468,337.80 and 145,905.20 is: 218,933.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,117.20 : 468,337.80 = 145,905.20 : x
  2. Step 2: Convert to fraction form
    312,117.20/468,337.80 = 145,905.20/x
  3. Step 3: Cross multiply
    312,117.20x = 468,337.80 × 145,905.20
  4. Step 4: Simplify right side
    312,117.20x = 68,332,920,376.56
  5. Step 5: Solve for x
    x = 68,332,920,376.56/312,117.20
  6. Step 6: Final answer
    x = 218,933.53

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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.