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Finding the Fourth Proportional to 66,489.78, 91,747.65 and 40,661.31

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Solution

The fourth proportional to 66,489.78, 91,747.65 and 40,661.31 is: 56,107.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.78 : 91,747.65 = 40,661.31 : x
  2. Step 2: Convert to fraction form
    66,489.78/91,747.65 = 40,661.31/x
  3. Step 3: Cross multiply
    66,489.78x = 91,747.65 × 40,661.31
  4. Step 4: Simplify right side
    66,489.78x = 3,730,579,638.42
  5. Step 5: Solve for x
    x = 3,730,579,638.42/66,489.78
  6. Step 6: Final answer
    x = 56,107.56

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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.