Home / 13,142.62-18,115.21-9,315.54

Finding the Fourth Proportional to 13,142.62, 18,115.21 and 9,315.54

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Solution

The fourth proportional to 13,142.62, 18,115.21 and 9,315.54 is: 12,840.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.62 : 18,115.21 = 9,315.54 : x
  2. Step 2: Convert to fraction form
    13,142.62/18,115.21 = 9,315.54/x
  3. Step 3: Cross multiply
    13,142.62x = 18,115.21 × 9,315.54
  4. Step 4: Simplify right side
    13,142.62x = 168,752,975.01
  5. Step 5: Solve for x
    x = 168,752,975.01/13,142.62
  6. Step 6: Final answer
    x = 12,840.13

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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.