Home / 12,972.80-19,446.40-5,171.20

Finding the Fourth Proportional to 12,972.80, 19,446.40 and 5,171.20

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Solution

The fourth proportional to 12,972.80, 19,446.40 and 5,171.20 is: 7,751.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,972.80 : 19,446.40 = 5,171.20 : x
  2. Step 2: Convert to fraction form
    12,972.80/19,446.40 = 5,171.20/x
  3. Step 3: Cross multiply
    12,972.80x = 19,446.40 × 5,171.20
  4. Step 4: Simplify right side
    12,972.80x = 100,561,223.68
  5. Step 5: Solve for x
    x = 100,561,223.68/12,972.80
  6. Step 6: Final answer
    x = 7,751.70

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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.