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Finding the Fourth Proportional to 12,681.20, 19,021.80 and 3,916.10

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Solution

The fourth proportional to 12,681.20, 19,021.80 and 3,916.10 is: 5,874.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,681.20 : 19,021.80 = 3,916.10 : x
  2. Step 2: Convert to fraction form
    12,681.20/19,021.80 = 3,916.10/x
  3. Step 3: Cross multiply
    12,681.20x = 19,021.80 × 3,916.10
  4. Step 4: Simplify right side
    12,681.20x = 74,491,270.98
  5. Step 5: Solve for x
    x = 74,491,270.98/12,681.20
  6. Step 6: Final answer
    x = 5,874.15

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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.