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Finding the Fourth Proportional to 8,689.15, 11,987.79 and 5,706.64

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Solution

The fourth proportional to 8,689.15, 11,987.79 and 5,706.64 is: 7,873.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.15 : 11,987.79 = 5,706.64 : x
  2. Step 2: Convert to fraction form
    8,689.15/11,987.79 = 5,706.64/x
  3. Step 3: Cross multiply
    8,689.15x = 11,987.79 × 5,706.64
  4. Step 4: Simplify right side
    8,689.15x = 68,410,001.93
  5. Step 5: Solve for x
    x = 68,410,001.93/8,689.15
  6. Step 6: Final answer
    x = 7,873.04

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1.5x scale

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.