Home / 12,378.40-18,584.08-7,188

Finding the Fourth Proportional to 12,378.40, 18,584.08 and 7,188

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Solution

The fourth proportional to 12,378.40, 18,584.08 and 7,188 is: 10,791.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,378.40 : 18,584.08 = 7,188 : x
  2. Step 2: Convert to fraction form
    12,378.40/18,584.08 = 7,188/x
  3. Step 3: Cross multiply
    12,378.40x = 18,584.08 × 7,188
  4. Step 4: Simplify right side
    12,378.40x = 133,582,367.04
  5. Step 5: Solve for x
    x = 133,582,367.04/12,378.40
  6. Step 6: Final answer
    x = 10,791.57

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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.