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Finding the Fourth Proportional to 6,641.72, 9,966.74 and 6,139.80

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Solution

The fourth proportional to 6,641.72, 9,966.74 and 6,139.80 is: 9,213.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,641.72 : 9,966.74 = 6,139.80 : x
  2. Step 2: Convert to fraction form
    6,641.72/9,966.74 = 6,139.80/x
  3. Step 3: Cross multiply
    6,641.72x = 9,966.74 × 6,139.80
  4. Step 4: Simplify right side
    6,641.72x = 61,193,790.25
  5. Step 5: Solve for x
    x = 61,193,790.25/6,641.72
  6. Step 6: Final answer
    x = 9,213.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.