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Finding the Fourth Proportional to 13,613.50, 20,420.25 and 4,379.50

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Solution

The fourth proportional to 13,613.50, 20,420.25 and 4,379.50 is: 6,569.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,613.50 : 20,420.25 = 4,379.50 : x
  2. Step 2: Convert to fraction form
    13,613.50/20,420.25 = 4,379.50/x
  3. Step 3: Cross multiply
    13,613.50x = 20,420.25 × 4,379.50
  4. Step 4: Simplify right side
    13,613.50x = 89,430,484.88
  5. Step 5: Solve for x
    x = 89,430,484.88/13,613.50
  6. Step 6: Final answer
    x = 6,569.25

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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.