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Finding the Fourth Proportional to 215,998.80, 323,998.20 and 66,237.90

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Solution

The fourth proportional to 215,998.80, 323,998.20 and 66,237.90 is: 99,356.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,998.80 : 323,998.20 = 66,237.90 : x
  2. Step 2: Convert to fraction form
    215,998.80/323,998.20 = 66,237.90/x
  3. Step 3: Cross multiply
    215,998.80x = 323,998.20 × 66,237.90
  4. Step 4: Simplify right side
    215,998.80x = 21,460,960,371.78
  5. Step 5: Solve for x
    x = 21,460,960,371.78/215,998.80
  6. Step 6: Final answer
    x = 99,356.85

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1.5x scale

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.