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Finding the Fourth Proportional to 66,312.62, 91,481.34 and 39,439.82

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Solution

The fourth proportional to 66,312.62, 91,481.34 and 39,439.82 is: 54,409.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,312.62 : 91,481.34 = 39,439.82 : x
  2. Step 2: Convert to fraction form
    66,312.62/91,481.34 = 39,439.82/x
  3. Step 3: Cross multiply
    66,312.62x = 91,481.34 × 39,439.82
  4. Step 4: Simplify right side
    66,312.62x = 3,608,007,582.96
  5. Step 5: Solve for x
    x = 3,608,007,582.96/66,312.62
  6. Step 6: Final answer
    x = 54,409.06

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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.