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Finding the Fourth Proportional to 12,912.80, 19,369.20 and 10,320.80

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Solution

The fourth proportional to 12,912.80, 19,369.20 and 10,320.80 is: 15,481.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912.80 : 19,369.20 = 10,320.80 : x
  2. Step 2: Convert to fraction form
    12,912.80/19,369.20 = 10,320.80/x
  3. Step 3: Cross multiply
    12,912.80x = 19,369.20 × 10,320.80
  4. Step 4: Simplify right side
    12,912.80x = 199,905,639.36
  5. Step 5: Solve for x
    x = 199,905,639.36/12,912.80
  6. Step 6: Final answer
    x = 15,481.20

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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.