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Finding the Fourth Proportional to 7,810.78, 11,716.14 and 3,132.88

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Solution

The fourth proportional to 7,810.78, 11,716.14 and 3,132.88 is: 4,699.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,810.78 : 11,716.14 = 3,132.88 : x
  2. Step 2: Convert to fraction form
    7,810.78/11,716.14 = 3,132.88/x
  3. Step 3: Cross multiply
    7,810.78x = 11,716.14 × 3,132.88
  4. Step 4: Simplify right side
    7,810.78x = 36,705,260.68
  5. Step 5: Solve for x
    x = 36,705,260.68/7,810.78
  6. Step 6: Final answer
    x = 4,699.31

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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.