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Finding the Fourth Proportional to 66,391.78, 91,621.06 and 39,535.42

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Solution

The fourth proportional to 66,391.78, 91,621.06 and 39,535.42 is: 54,559.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,391.78 : 91,621.06 = 39,535.42 : x
  2. Step 2: Convert to fraction form
    66,391.78/91,621.06 = 39,535.42/x
  3. Step 3: Cross multiply
    66,391.78x = 91,621.06 × 39,535.42
  4. Step 4: Simplify right side
    66,391.78x = 3,622,276,840.95
  5. Step 5: Solve for x
    x = 3,622,276,840.95/66,391.78
  6. Step 6: Final answer
    x = 54,559.12

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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.