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Finding the Fourth Proportional to 7,807.36, 11,712 and 3,189.76

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Solution

The fourth proportional to 7,807.36, 11,712 and 3,189.76 is: 4,785.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,807.36 : 11,712 = 3,189.76 : x
  2. Step 2: Convert to fraction form
    7,807.36/11,712 = 3,189.76/x
  3. Step 3: Cross multiply
    7,807.36x = 11,712 × 3,189.76
  4. Step 4: Simplify right side
    7,807.36x = 37,358,469.12
  5. Step 5: Solve for x
    x = 37,358,469.12/7,807.36
  6. Step 6: Final answer
    x = 4,785.03

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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.