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Finding the Fourth Proportional to 20,691.56, 30,982.26 and 14,130.56

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Solution

The fourth proportional to 20,691.56, 30,982.26 and 14,130.56 is: 21,158.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.56 : 30,982.26 = 14,130.56 : x
  2. Step 2: Convert to fraction form
    20,691.56/30,982.26 = 14,130.56/x
  3. Step 3: Cross multiply
    20,691.56x = 30,982.26 × 14,130.56
  4. Step 4: Simplify right side
    20,691.56x = 437,796,683.87
  5. Step 5: Solve for x
    x = 437,796,683.87/20,691.56
  6. Step 6: Final answer
    x = 21,158.23

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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.