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Finding the Fourth Proportional to 66,382.51, 99,583.58 and 21,388.78

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Solution

The fourth proportional to 66,382.51, 99,583.58 and 21,388.78 is: 32,086.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,382.51 : 99,583.58 = 21,388.78 : x
  2. Step 2: Convert to fraction form
    66,382.51/99,583.58 = 21,388.78/x
  3. Step 3: Cross multiply
    66,382.51x = 99,583.58 × 21,388.78
  4. Step 4: Simplify right side
    66,382.51x = 2,129,971,284.23
  5. Step 5: Solve for x
    x = 2,129,971,284.23/66,382.51
  6. Step 6: Final answer
    x = 32,086.33

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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.