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Finding the Fourth Proportional to 8,670.78, 11,965.61 and 4,691.88

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Solution

The fourth proportional to 8,670.78, 11,965.61 and 4,691.88 is: 6,474.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,670.78 : 11,965.61 = 4,691.88 : x
  2. Step 2: Convert to fraction form
    8,670.78/11,965.61 = 4,691.88/x
  3. Step 3: Cross multiply
    8,670.78x = 11,965.61 × 4,691.88
  4. Step 4: Simplify right side
    8,670.78x = 56,141,217.98
  5. Step 5: Solve for x
    x = 56,141,217.98/8,670.78
  6. Step 6: Final answer
    x = 6,474.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.