Home / 12,916.78-19,378.84-6,680.20

Finding the Fourth Proportional to 12,916.78, 19,378.84 and 6,680.20

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Solution

The fourth proportional to 12,916.78, 19,378.84 and 6,680.20 is: 10,022.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,916.78 : 19,378.84 = 6,680.20 : x
  2. Step 2: Convert to fraction form
    12,916.78/19,378.84 = 6,680.20/x
  3. Step 3: Cross multiply
    12,916.78x = 19,378.84 × 6,680.20
  4. Step 4: Simplify right side
    12,916.78x = 129,454,526.97
  5. Step 5: Solve for x
    x = 129,454,526.97/12,916.78
  6. Step 6: Final answer
    x = 10,022.20

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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.