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Finding the Fourth Proportional to 20,572.56, 30,840.36 and 7,421.85

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Solution

The fourth proportional to 20,572.56, 30,840.36 and 7,421.85 is: 11,126.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.56 : 30,840.36 = 7,421.85 : x
  2. Step 2: Convert to fraction form
    20,572.56/30,840.36 = 7,421.85/x
  3. Step 3: Cross multiply
    20,572.56x = 30,840.36 × 7,421.85
  4. Step 4: Simplify right side
    20,572.56x = 228,892,525.87
  5. Step 5: Solve for x
    x = 228,892,525.87/20,572.56
  6. Step 6: Final answer
    x = 11,126.11

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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.