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Finding the Fourth Proportional to 13,431.58, 18,530.58 and 8,324.79

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Solution

The fourth proportional to 13,431.58, 18,530.58 and 8,324.79 is: 11,485.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.58 : 18,530.58 = 8,324.79 : x
  2. Step 2: Convert to fraction form
    13,431.58/18,530.58 = 8,324.79/x
  3. Step 3: Cross multiply
    13,431.58x = 18,530.58 × 8,324.79
  4. Step 4: Simplify right side
    13,431.58x = 154,263,187.08
  5. Step 5: Solve for x
    x = 154,263,187.08/13,431.58
  6. Step 6: Final answer
    x = 11,485.11

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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.