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Finding the Fourth Proportional to 15,115.18, 20,853.42 and 9,144.67

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Solution

The fourth proportional to 15,115.18, 20,853.42 and 9,144.67 is: 12,616.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.18 : 20,853.42 = 9,144.67 : x
  2. Step 2: Convert to fraction form
    15,115.18/20,853.42 = 9,144.67/x
  3. Step 3: Cross multiply
    15,115.18x = 20,853.42 × 9,144.67
  4. Step 4: Simplify right side
    15,115.18x = 190,697,732.75
  5. Step 5: Solve for x
    x = 190,697,732.75/15,115.18
  6. Step 6: Final answer
    x = 12,616.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.