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Finding the Fourth Proportional to 215,721.60, 323,467.20 and 90,921.60

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Solution

The fourth proportional to 215,721.60, 323,467.20 and 90,921.60 is: 136,333.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,721.60 : 323,467.20 = 90,921.60 : x
  2. Step 2: Convert to fraction form
    215,721.60/323,467.20 = 90,921.60/x
  3. Step 3: Cross multiply
    215,721.60x = 323,467.20 × 90,921.60
  4. Step 4: Simplify right side
    215,721.60x = 29,410,155,371.52
  5. Step 5: Solve for x
    x = 29,410,155,371.52/215,721.60
  6. Step 6: Final answer
    x = 136,333.85

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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.