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Finding the Fourth Proportional to 20,471.88, 30,712.50 and 7,145.40

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Solution

The fourth proportional to 20,471.88, 30,712.50 and 7,145.40 is: 10,719.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,471.88 : 30,712.50 = 7,145.40 : x
  2. Step 2: Convert to fraction form
    20,471.88/30,712.50 = 7,145.40/x
  3. Step 3: Cross multiply
    20,471.88x = 30,712.50 × 7,145.40
  4. Step 4: Simplify right side
    20,471.88x = 219,453,097.50
  5. Step 5: Solve for x
    x = 219,453,097.50/20,471.88
  6. Step 6: Final answer
    x = 10,719.73

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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.