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Finding the Fourth Proportional to 66,516.74, 91,804.81 and 39,660.90

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Solution

The fourth proportional to 66,516.74, 91,804.81 and 39,660.90 is: 54,739.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,516.74 : 91,804.81 = 39,660.90 : x
  2. Step 2: Convert to fraction form
    66,516.74/91,804.81 = 39,660.90/x
  3. Step 3: Cross multiply
    66,516.74x = 91,804.81 × 39,660.90
  4. Step 4: Simplify right side
    66,516.74x = 3,641,061,388.93
  5. Step 5: Solve for x
    x = 3,641,061,388.93/66,516.74
  6. Step 6: Final answer
    x = 54,739.02

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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.