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Finding the Fourth Proportional to 6,617.18, 9,920.91 and 3,156.86

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Solution

The fourth proportional to 6,617.18, 9,920.91 and 3,156.86 is: 4,732.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,617.18 : 9,920.91 = 3,156.86 : x
  2. Step 2: Convert to fraction form
    6,617.18/9,920.91 = 3,156.86/x
  3. Step 3: Cross multiply
    6,617.18x = 9,920.91 × 3,156.86
  4. Step 4: Simplify right side
    6,617.18x = 31,318,923.94
  5. Step 5: Solve for x
    x = 31,318,923.94/6,617.18
  6. Step 6: Final answer
    x = 4,732.97

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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.