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Finding the Fourth Proportional to 20,690.56, 30,980.76 and 14,129.56

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Solution

The fourth proportional to 20,690.56, 30,980.76 and 14,129.56 is: 21,156.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.56 : 30,980.76 = 14,129.56 : x
  2. Step 2: Convert to fraction form
    20,690.56/30,980.76 = 14,129.56/x
  3. Step 3: Cross multiply
    20,690.56x = 30,980.76 × 14,129.56
  4. Step 4: Simplify right side
    20,690.56x = 437,744,507.27
  5. Step 5: Solve for x
    x = 437,744,507.27/20,690.56
  6. Step 6: Final answer
    x = 21,156.73

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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.