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Finding the Fourth Proportional to 13,421.16, 20,144.54 and 8,237.16

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Solution

The fourth proportional to 13,421.16, 20,144.54 and 8,237.16 is: 12,363.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.16 : 20,144.54 = 8,237.16 : x
  2. Step 2: Convert to fraction form
    13,421.16/20,144.54 = 8,237.16/x
  3. Step 3: Cross multiply
    13,421.16x = 20,144.54 × 8,237.16
  4. Step 4: Simplify right side
    13,421.16x = 165,933,799.11
  5. Step 5: Solve for x
    x = 165,933,799.11/13,421.16
  6. Step 6: Final answer
    x = 12,363.60

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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.