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Finding the Fourth Proportional to 8,657.87, 12,987.42 and 3,111.26

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Solution

The fourth proportional to 8,657.87, 12,987.42 and 3,111.26 is: 4,667.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,657.87 : 12,987.42 = 3,111.26 : x
  2. Step 2: Convert to fraction form
    8,657.87/12,987.42 = 3,111.26/x
  3. Step 3: Cross multiply
    8,657.87x = 12,987.42 × 3,111.26
  4. Step 4: Simplify right side
    8,657.87x = 40,407,240.35
  5. Step 5: Solve for x
    x = 40,407,240.35/8,657.87
  6. Step 6: Final answer
    x = 4,667.11

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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.