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Finding the Fourth Proportional to 215,532.80, 323,644.80 and 145,721.60

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Solution

The fourth proportional to 215,532.80, 323,644.80 and 145,721.60 is: 218,816.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,532.80 : 323,644.80 = 145,721.60 : x
  2. Step 2: Convert to fraction form
    215,532.80/323,644.80 = 145,721.60/x
  3. Step 3: Cross multiply
    215,532.80x = 323,644.80 × 145,721.60
  4. Step 4: Simplify right side
    215,532.80x = 47,162,038,087.68
  5. Step 5: Solve for x
    x = 47,162,038,087.68/215,532.80
  6. Step 6: Final answer
    x = 218,816.06

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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.