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Finding the Fourth Proportional to 66,836, 92,233.70 and 39,979.64

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Solution

The fourth proportional to 66,836, 92,233.70 and 39,979.64 is: 55,171.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,836 : 92,233.70 = 39,979.64 : x
  2. Step 2: Convert to fraction form
    66,836/92,233.70 = 39,979.64/x
  3. Step 3: Cross multiply
    66,836x = 92,233.70 × 39,979.64
  4. Step 4: Simplify right side
    66,836x = 3,687,470,121.87
  5. Step 5: Solve for x
    x = 3,687,470,121.87/66,836
  6. Step 6: Final answer
    x = 55,171.92

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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.