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Finding the Fourth Proportional to 8,709.66, 12,015.36 and 5,170.86

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Solution

The fourth proportional to 8,709.66, 12,015.36 and 5,170.86 is: 7,133.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,709.66 : 12,015.36 = 5,170.86 : x
  2. Step 2: Convert to fraction form
    8,709.66/12,015.36 = 5,170.86/x
  3. Step 3: Cross multiply
    8,709.66x = 12,015.36 × 5,170.86
  4. Step 4: Simplify right side
    8,709.66x = 62,129,744.41
  5. Step 5: Solve for x
    x = 62,129,744.41/8,709.66
  6. Step 6: Final answer
    x = 7,133.43

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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.