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Finding the Fourth Proportional to 20,570.56, 30,849.46 and 7,421.22

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Solution

The fourth proportional to 20,570.56, 30,849.46 and 7,421.22 is: 11,129.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,570.56 : 30,849.46 = 7,421.22 : x
  2. Step 2: Convert to fraction form
    20,570.56/30,849.46 = 7,421.22/x
  3. Step 3: Cross multiply
    20,570.56x = 30,849.46 × 7,421.22
  4. Step 4: Simplify right side
    20,570.56x = 228,940,456.74
  5. Step 5: Solve for x
    x = 228,940,456.74/20,570.56
  6. Step 6: Final answer
    x = 11,129.52

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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.