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Finding the Fourth Proportional to 215,886.80, 323,830.20 and 66,125.90

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Solution

The fourth proportional to 215,886.80, 323,830.20 and 66,125.90 is: 99,188.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,886.80 : 323,830.20 = 66,125.90 : x
  2. Step 2: Convert to fraction form
    215,886.80/323,830.20 = 66,125.90/x
  3. Step 3: Cross multiply
    215,886.80x = 323,830.20 × 66,125.90
  4. Step 4: Simplify right side
    215,886.80x = 21,413,563,422.18
  5. Step 5: Solve for x
    x = 21,413,563,422.18/215,886.80
  6. Step 6: Final answer
    x = 99,188.85

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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.