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Finding the Fourth Proportional to 66,387, 91,612.91 and 36,172.55

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Solution

The fourth proportional to 66,387, 91,612.91 and 36,172.55 is: 49,917.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,387 : 91,612.91 = 36,172.55 : x
  2. Step 2: Convert to fraction form
    66,387/91,612.91 = 36,172.55/x
  3. Step 3: Cross multiply
    66,387x = 91,612.91 × 36,172.55
  4. Step 4: Simplify right side
    66,387x = 3,313,871,928.69
  5. Step 5: Solve for x
    x = 3,313,871,928.69/66,387
  6. Step 6: Final answer
    x = 49,917.48

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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.