Home / 10,919.60-16,379.40-3,129.20

Finding the Fourth Proportional to 10,919.60, 16,379.40 and 3,129.20

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Solution

The fourth proportional to 10,919.60, 16,379.40 and 3,129.20 is: 4,693.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,919.60 : 16,379.40 = 3,129.20 : x
  2. Step 2: Convert to fraction form
    10,919.60/16,379.40 = 3,129.20/x
  3. Step 3: Cross multiply
    10,919.60x = 16,379.40 × 3,129.20
  4. Step 4: Simplify right side
    10,919.60x = 51,254,418.48
  5. Step 5: Solve for x
    x = 51,254,418.48/10,919.60
  6. Step 6: Final answer
    x = 4,693.80

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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.