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Finding the Fourth Proportional to 18,309.81, 27,458.22 and 7,915.89

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Solution

The fourth proportional to 18,309.81, 27,458.22 and 7,915.89 is: 11,871.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,309.81 : 27,458.22 = 7,915.89 : x
  2. Step 2: Convert to fraction form
    18,309.81/27,458.22 = 7,915.89/x
  3. Step 3: Cross multiply
    18,309.81x = 27,458.22 × 7,915.89
  4. Step 4: Simplify right side
    18,309.81x = 217,356,249.12
  5. Step 5: Solve for x
    x = 217,356,249.12/18,309.81
  6. Step 6: Final answer
    x = 11,871.03

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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.