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Finding the Fourth Proportional to 8,320.78, 11,485.17 and 4,965.94

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Solution

The fourth proportional to 8,320.78, 11,485.17 and 4,965.94 is: 6,854.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,320.78 : 11,485.17 = 4,965.94 : x
  2. Step 2: Convert to fraction form
    8,320.78/11,485.17 = 4,965.94/x
  3. Step 3: Cross multiply
    8,320.78x = 11,485.17 × 4,965.94
  4. Step 4: Simplify right side
    8,320.78x = 57,034,665.11
  5. Step 5: Solve for x
    x = 57,034,665.11/8,320.78
  6. Step 6: Final answer
    x = 6,854.49

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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.