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Finding the Fourth Proportional to 7,788.72, 11,678.76 and 2,591.76

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Solution

The fourth proportional to 7,788.72, 11,678.76 and 2,591.76 is: 3,886.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,788.72 : 11,678.76 = 2,591.76 : x
  2. Step 2: Convert to fraction form
    7,788.72/11,678.76 = 2,591.76/x
  3. Step 3: Cross multiply
    7,788.72x = 11,678.76 × 2,591.76
  4. Step 4: Simplify right side
    7,788.72x = 30,268,543.02
  5. Step 5: Solve for x
    x = 30,268,543.02/7,788.72
  6. Step 6: Final answer
    x = 3,886.20

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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.