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Finding the Fourth Proportional to 15,170.85, 20,935.08 and 8,457.21

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Solution

The fourth proportional to 15,170.85, 20,935.08 and 8,457.21 is: 11,670.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,170.85 : 20,935.08 = 8,457.21 : x
  2. Step 2: Convert to fraction form
    15,170.85/20,935.08 = 8,457.21/x
  3. Step 3: Cross multiply
    15,170.85x = 20,935.08 × 8,457.21
  4. Step 4: Simplify right side
    15,170.85x = 177,052,367.93
  5. Step 5: Solve for x
    x = 177,052,367.93/15,170.85
  6. Step 6: Final answer
    x = 11,670.56

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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.