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Finding the Fourth Proportional to 66,640.34, 91,961.12 and 36,425.40

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Solution

The fourth proportional to 66,640.34, 91,961.12 and 36,425.40 is: 50,265.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,640.34 : 91,961.12 = 36,425.40 : x
  2. Step 2: Convert to fraction form
    66,640.34/91,961.12 = 36,425.40/x
  3. Step 3: Cross multiply
    66,640.34x = 91,961.12 × 36,425.40
  4. Step 4: Simplify right side
    66,640.34x = 3,349,720,671.51
  5. Step 5: Solve for x
    x = 3,349,720,671.51/66,640.34
  6. Step 6: Final answer
    x = 50,265.66

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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.