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Finding the Fourth Proportional to 66,260.63, 99,369.74 and 21,879.11

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Solution

The fourth proportional to 66,260.63, 99,369.74 and 21,879.11 is: 32,811.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,260.63 : 99,369.74 = 21,879.11 : x
  2. Step 2: Convert to fraction form
    66,260.63/99,369.74 = 21,879.11/x
  3. Step 3: Cross multiply
    66,260.63x = 99,369.74 × 21,879.11
  4. Step 4: Simplify right side
    66,260.63x = 2,174,120,975.28
  5. Step 5: Solve for x
    x = 2,174,120,975.28/66,260.63
  6. Step 6: Final answer
    x = 32,811.66

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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.