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Finding the Fourth Proportional to 66,080.55, 99,133.20 and 21,720.09

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Solution

The fourth proportional to 66,080.55, 99,133.20 and 21,720.09 is: 32,584.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,080.55 : 99,133.20 = 21,720.09 : x
  2. Step 2: Convert to fraction form
    66,080.55/99,133.20 = 21,720.09/x
  3. Step 3: Cross multiply
    66,080.55x = 99,133.20 × 21,720.09
  4. Step 4: Simplify right side
    66,080.55x = 2,153,182,025.99
  5. Step 5: Solve for x
    x = 2,153,182,025.99/66,080.55
  6. Step 6: Final answer
    x = 32,584.20

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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.