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Finding the Fourth Proportional to 66,515.31, 91,791.90 and 39,673.08

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Solution

The fourth proportional to 66,515.31, 91,791.90 and 39,673.08 is: 54,749.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,515.31 : 91,791.90 = 39,673.08 : x
  2. Step 2: Convert to fraction form
    66,515.31/91,791.90 = 39,673.08/x
  3. Step 3: Cross multiply
    66,515.31x = 91,791.90 × 39,673.08
  4. Step 4: Simplify right side
    66,515.31x = 3,641,667,392.05
  5. Step 5: Solve for x
    x = 3,641,667,392.05/66,515.31
  6. Step 6: Final answer
    x = 54,749.31

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1.5x scale

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.