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Finding the Fourth Proportional to 20,471.40, 30,690.77 and 11,581.25

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Solution

The fourth proportional to 20,471.40, 30,690.77 and 11,581.25 is: 17,362.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,471.40 : 30,690.77 = 11,581.25 : x
  2. Step 2: Convert to fraction form
    20,471.40/30,690.77 = 11,581.25/x
  3. Step 3: Cross multiply
    20,471.40x = 30,690.77 × 11,581.25
  4. Step 4: Simplify right side
    20,471.40x = 355,437,268.70
  5. Step 5: Solve for x
    x = 355,437,268.70/20,471.40
  6. Step 6: Final answer
    x = 17,362.63

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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.