Home / 13,130.76-19,672.90-8,439.78

Finding the Fourth Proportional to 13,130.76, 19,672.90 and 8,439.78

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Solution

The fourth proportional to 13,130.76, 19,672.90 and 8,439.78 is: 12,644.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,130.76 : 19,672.90 = 8,439.78 : x
  2. Step 2: Convert to fraction form
    13,130.76/19,672.90 = 8,439.78/x
  3. Step 3: Cross multiply
    13,130.76x = 19,672.90 × 8,439.78
  4. Step 4: Simplify right side
    13,130.76x = 166,034,947.96
  5. Step 5: Solve for x
    x = 166,034,947.96/13,130.76
  6. Step 6: Final answer
    x = 12,644.73

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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.