Home / 6,601.60-9,890.40-3,131.20

Finding the Fourth Proportional to 6,601.60, 9,890.40 and 3,131.20

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Solution

The fourth proportional to 6,601.60, 9,890.40 and 3,131.20 is: 4,691.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,601.60 : 9,890.40 = 3,131.20 : x
  2. Step 2: Convert to fraction form
    6,601.60/9,890.40 = 3,131.20/x
  3. Step 3: Cross multiply
    6,601.60x = 9,890.40 × 3,131.20
  4. Step 4: Simplify right side
    6,601.60x = 30,968,820.48
  5. Step 5: Solve for x
    x = 30,968,820.48/6,601.60
  6. Step 6: Final answer
    x = 4,691.11

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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.