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Finding the Fourth Proportional to 66,343.20, 91,643.52 and 61,619.52

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Solution

The fourth proportional to 66,343.20, 91,643.52 and 61,619.52 is: 85,118.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,343.20 : 91,643.52 = 61,619.52 : x
  2. Step 2: Convert to fraction form
    66,343.20/91,643.52 = 61,619.52/x
  3. Step 3: Cross multiply
    66,343.20x = 91,643.52 × 61,619.52
  4. Step 4: Simplify right side
    66,343.20x = 5,647,029,713.51
  5. Step 5: Solve for x
    x = 5,647,029,713.51/66,343.20
  6. Step 6: Final answer
    x = 85,118.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.