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Finding the Fourth Proportional to 8,659.90, 12,960.69 and 5,199.58

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Solution

The fourth proportional to 8,659.90, 12,960.69 and 5,199.58 is: 7,781.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.90 : 12,960.69 = 5,199.58 : x
  2. Step 2: Convert to fraction form
    8,659.90/12,960.69 = 5,199.58/x
  3. Step 3: Cross multiply
    8,659.90x = 12,960.69 × 5,199.58
  4. Step 4: Simplify right side
    8,659.90x = 67,390,144.51
  5. Step 5: Solve for x
    x = 67,390,144.51/8,659.90
  6. Step 6: Final answer
    x = 7,781.86

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1.5x scale

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.