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Finding the Fourth Proportional to 8,479.64, 12,647.91 and 7,991.92

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Solution

The fourth proportional to 8,479.64, 12,647.91 and 7,991.92 is: 11,920.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.64 : 12,647.91 = 7,991.92 : x
  2. Step 2: Convert to fraction form
    8,479.64/12,647.91 = 7,991.92/x
  3. Step 3: Cross multiply
    8,479.64x = 12,647.91 × 7,991.92
  4. Step 4: Simplify right side
    8,479.64x = 101,081,084.89
  5. Step 5: Solve for x
    x = 101,081,084.89/8,479.64
  6. Step 6: Final answer
    x = 11,920.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.