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Finding the Fourth Proportional to 12,238.48, 18,343.14 and 6,391.90

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Solution

The fourth proportional to 12,238.48, 18,343.14 and 6,391.90 is: 9,580.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,238.48 : 18,343.14 = 6,391.90 : x
  2. Step 2: Convert to fraction form
    12,238.48/18,343.14 = 6,391.90/x
  3. Step 3: Cross multiply
    12,238.48x = 18,343.14 × 6,391.90
  4. Step 4: Simplify right side
    12,238.48x = 117,247,516.57
  5. Step 5: Solve for x
    x = 117,247,516.57/12,238.48
  6. Step 6: Final answer
    x = 9,580.24

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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.