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Finding the Fourth Proportional to 66,400.65, 99,610.79 and 21,406.97

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Solution

The fourth proportional to 66,400.65, 99,610.79 and 21,406.97 is: 32,113.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,400.65 : 99,610.79 = 21,406.97 : x
  2. Step 2: Convert to fraction form
    66,400.65/99,610.79 = 21,406.97/x
  3. Step 3: Cross multiply
    66,400.65x = 99,610.79 × 21,406.97
  4. Step 4: Simplify right side
    66,400.65x = 2,132,364,588.12
  5. Step 5: Solve for x
    x = 2,132,364,588.12/66,400.65
  6. Step 6: Final answer
    x = 32,113.61

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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.