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Finding the Fourth Proportional to 13,963.10, 20,916.30 and 8,681.90

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Solution

The fourth proportional to 13,963.10, 20,916.30 and 8,681.90 is: 13,005.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,963.10 : 20,916.30 = 8,681.90 : x
  2. Step 2: Convert to fraction form
    13,963.10/20,916.30 = 8,681.90/x
  3. Step 3: Cross multiply
    13,963.10x = 20,916.30 × 8,681.90
  4. Step 4: Simplify right side
    13,963.10x = 181,593,224.97
  5. Step 5: Solve for x
    x = 181,593,224.97/13,963.10
  6. Step 6: Final answer
    x = 13,005.22

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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.