Home / 12,930.80-19,396.28-5,139.60

Finding the Fourth Proportional to 12,930.80, 19,396.28 and 5,139.60

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Solution

The fourth proportional to 12,930.80, 19,396.28 and 5,139.60 is: 7,709.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,930.80 : 19,396.28 = 5,139.60 : x
  2. Step 2: Convert to fraction form
    12,930.80/19,396.28 = 5,139.60/x
  3. Step 3: Cross multiply
    12,930.80x = 19,396.28 × 5,139.60
  4. Step 4: Simplify right side
    12,930.80x = 99,689,120.69
  5. Step 5: Solve for x
    x = 99,689,120.69/12,930.80
  6. Step 6: Final answer
    x = 7,709.43

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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.