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Finding the Fourth Proportional to 7,785, 11,641.92 and 5,811.96

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Solution

The fourth proportional to 7,785, 11,641.92 and 5,811.96 is: 8,691.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,785 : 11,641.92 = 5,811.96 : x
  2. Step 2: Convert to fraction form
    7,785/11,641.92 = 5,811.96/x
  3. Step 3: Cross multiply
    7,785x = 11,641.92 × 5,811.96
  4. Step 4: Simplify right side
    7,785x = 67,662,373.36
  5. Step 5: Solve for x
    x = 67,662,373.36/7,785
  6. Step 6: Final answer
    x = 8,691.38

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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.