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Finding the Fourth Proportional to 66,090.12, 99,150.78 and 21,717

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Solution

The fourth proportional to 66,090.12, 99,150.78 and 21,717 is: 32,580.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,090.12 : 99,150.78 = 21,717 : x
  2. Step 2: Convert to fraction form
    66,090.12/99,150.78 = 21,717/x
  3. Step 3: Cross multiply
    66,090.12x = 99,150.78 × 21,717
  4. Step 4: Simplify right side
    66,090.12x = 2,153,257,489.26
  5. Step 5: Solve for x
    x = 2,153,257,489.26/66,090.12
  6. Step 6: Final answer
    x = 32,580.63

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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.