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Finding the Fourth Proportional to 8,656.85, 12,979.74 and 5,145.92

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Solution

The fourth proportional to 8,656.85, 12,979.74 and 5,145.92 is: 7,715.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,656.85 : 12,979.74 = 5,145.92 : x
  2. Step 2: Convert to fraction form
    8,656.85/12,979.74 = 5,145.92/x
  3. Step 3: Cross multiply
    8,656.85x = 12,979.74 × 5,145.92
  4. Step 4: Simplify right side
    8,656.85x = 66,792,703.66
  5. Step 5: Solve for x
    x = 66,792,703.66/8,656.85
  6. Step 6: Final answer
    x = 7,715.59

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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.