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Finding the Fourth Proportional to 6,111.90, 9,171.90 and 3,479.40

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Solution

The fourth proportional to 6,111.90, 9,171.90 and 3,479.40 is: 5,221.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,111.90 : 9,171.90 = 3,479.40 : x
  2. Step 2: Convert to fraction form
    6,111.90/9,171.90 = 3,479.40/x
  3. Step 3: Cross multiply
    6,111.90x = 9,171.90 × 3,479.40
  4. Step 4: Simplify right side
    6,111.90x = 31,912,708.86
  5. Step 5: Solve for x
    x = 31,912,708.86/6,111.90
  6. Step 6: Final answer
    x = 5,221.41

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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.