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Finding the Fourth Proportional to 20,425.86, 30,635.12 and 5,631.12

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Solution

The fourth proportional to 20,425.86, 30,635.12 and 5,631.12 is: 8,445.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425.86 : 30,635.12 = 5,631.12 : x
  2. Step 2: Convert to fraction form
    20,425.86/30,635.12 = 5,631.12/x
  3. Step 3: Cross multiply
    20,425.86x = 30,635.12 × 5,631.12
  4. Step 4: Simplify right side
    20,425.86x = 172,510,051.01
  5. Step 5: Solve for x
    x = 172,510,051.01/20,425.86
  6. Step 6: Final answer
    x = 8,445.67

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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.