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Finding the Fourth Proportional to 221,264.80, 331,282.80 and 215,120.80

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Solution

The fourth proportional to 221,264.80, 331,282.80 and 215,120.80 is: 322,083.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,264.80 : 331,282.80 = 215,120.80 : x
  2. Step 2: Convert to fraction form
    221,264.80/331,282.80 = 215,120.80/x
  3. Step 3: Cross multiply
    221,264.80x = 331,282.80 × 215,120.80
  4. Step 4: Simplify right side
    221,264.80x = 71,265,820,962.24
  5. Step 5: Solve for x
    x = 71,265,820,962.24/221,264.80
  6. Step 6: Final answer
    x = 322,083.86

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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.