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Finding the Fourth Proportional to 20,403.30, 30,605.08 and 5,613.78

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Solution

The fourth proportional to 20,403.30, 30,605.08 and 5,613.78 is: 8,420.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.30 : 30,605.08 = 5,613.78 : x
  2. Step 2: Convert to fraction form
    20,403.30/30,605.08 = 5,613.78/x
  3. Step 3: Cross multiply
    20,403.30x = 30,605.08 × 5,613.78
  4. Step 4: Simplify right side
    20,403.30x = 171,810,186.00
  5. Step 5: Solve for x
    x = 171,810,186.00/20,403.30
  6. Step 6: Final answer
    x = 8,420.71

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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.