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Finding the Fourth Proportional to 66,285.35, 99,443.60 and 21,912.10

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Solution

The fourth proportional to 66,285.35, 99,443.60 and 21,912.10 is: 32,873.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,285.35 : 99,443.60 = 21,912.10 : x
  2. Step 2: Convert to fraction form
    66,285.35/99,443.60 = 21,912.10/x
  3. Step 3: Cross multiply
    66,285.35x = 99,443.60 × 21,912.10
  4. Step 4: Simplify right side
    66,285.35x = 2,179,018,390.93
  5. Step 5: Solve for x
    x = 2,179,018,390.93/66,285.35
  6. Step 6: Final answer
    x = 32,873.30

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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.