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Finding the Fourth Proportional to 13,981, 20,972.70 and 4,621

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Solution

The fourth proportional to 13,981, 20,972.70 and 4,621 is: 6,931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981 : 20,972.70 = 4,621 : x
  2. Step 2: Convert to fraction form
    13,981/20,972.70 = 4,621/x
  3. Step 3: Cross multiply
    13,981x = 20,972.70 × 4,621
  4. Step 4: Simplify right side
    13,981x = 96,914,846.70
  5. Step 5: Solve for x
    x = 96,914,846.70/13,981
  6. Step 6: Final answer
    x = 6,931.90

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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.