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Finding the Fourth Proportional to 66,215.84, 91,379.78 and 40,375.91

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Solution

The fourth proportional to 66,215.84, 91,379.78 and 40,375.91 is: 55,719.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,215.84 : 91,379.78 = 40,375.91 : x
  2. Step 2: Convert to fraction form
    66,215.84/91,379.78 = 40,375.91/x
  3. Step 3: Cross multiply
    66,215.84x = 91,379.78 × 40,375.91
  4. Step 4: Simplify right side
    66,215.84x = 3,689,541,571.22
  5. Step 5: Solve for x
    x = 3,689,541,571.22/66,215.84
  6. Step 6: Final answer
    x = 55,719.92

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1.5x scale

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.