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Finding the Fourth Proportional to 66,005.50, 91,050.32 and 39,121.60

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Solution

The fourth proportional to 66,005.50, 91,050.32 and 39,121.60 is: 53,965.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,005.50 : 91,050.32 = 39,121.60 : x
  2. Step 2: Convert to fraction form
    66,005.50/91,050.32 = 39,121.60/x
  3. Step 3: Cross multiply
    66,005.50x = 91,050.32 × 39,121.60
  4. Step 4: Simplify right side
    66,005.50x = 3,562,034,198.91
  5. Step 5: Solve for x
    x = 3,562,034,198.91/66,005.50
  6. Step 6: Final answer
    x = 53,965.72

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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.