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Finding the Fourth Proportional to 12,438.96, 17,160.84 and 8,661.12

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Solution

The fourth proportional to 12,438.96, 17,160.84 and 8,661.12 is: 11,948.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438.96 : 17,160.84 = 8,661.12 : x
  2. Step 2: Convert to fraction form
    12,438.96/17,160.84 = 8,661.12/x
  3. Step 3: Cross multiply
    12,438.96x = 17,160.84 × 8,661.12
  4. Step 4: Simplify right side
    12,438.96x = 148,632,094.54
  5. Step 5: Solve for x
    x = 148,632,094.54/12,438.96
  6. Step 6: Final answer
    x = 11,948.92

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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.