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Finding the Fourth Proportional to 66,606.13, 91,915.38 and 36,390.80

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Solution

The fourth proportional to 66,606.13, 91,915.38 and 36,390.80 is: 50,218.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,606.13 : 91,915.38 = 36,390.80 : x
  2. Step 2: Convert to fraction form
    66,606.13/91,915.38 = 36,390.80/x
  3. Step 3: Cross multiply
    66,606.13x = 91,915.38 × 36,390.80
  4. Step 4: Simplify right side
    66,606.13x = 3,344,874,440.29
  5. Step 5: Solve for x
    x = 3,344,874,440.29/66,606.13
  6. Step 6: Final answer
    x = 50,218.72

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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.