Home / 12,911.60-19,372.80-4,149.20

Finding the Fourth Proportional to 12,911.60, 19,372.80 and 4,149.20

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Solution

The fourth proportional to 12,911.60, 19,372.80 and 4,149.20 is: 6,225.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,911.60 : 19,372.80 = 4,149.20 : x
  2. Step 2: Convert to fraction form
    12,911.60/19,372.80 = 4,149.20/x
  3. Step 3: Cross multiply
    12,911.60x = 19,372.80 × 4,149.20
  4. Step 4: Simplify right side
    12,911.60x = 80,381,621.76
  5. Step 5: Solve for x
    x = 80,381,621.76/12,911.60
  6. Step 6: Final answer
    x = 6,225.54

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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.