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Finding the Fourth Proportional to 66,640.71, 91,960.64 and 36,420.21

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Solution

The fourth proportional to 66,640.71, 91,960.64 and 36,420.21 is: 50,257.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,640.71 : 91,960.64 = 36,420.21 : x
  2. Step 2: Convert to fraction form
    66,640.71/91,960.64 = 36,420.21/x
  3. Step 3: Cross multiply
    66,640.71x = 91,960.64 × 36,420.21
  4. Step 4: Simplify right side
    66,640.71x = 3,349,225,638.43
  5. Step 5: Solve for x
    x = 3,349,225,638.43/66,640.71
  6. Step 6: Final answer
    x = 50,257.95

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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.