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Finding the Fourth Proportional to 13,134.78, 18,125.94 and 8,419.08

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Solution

The fourth proportional to 13,134.78, 18,125.94 and 8,419.08 is: 11,618.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,134.78 : 18,125.94 = 8,419.08 : x
  2. Step 2: Convert to fraction form
    13,134.78/18,125.94 = 8,419.08/x
  3. Step 3: Cross multiply
    13,134.78x = 18,125.94 × 8,419.08
  4. Step 4: Simplify right side
    13,134.78x = 152,603,738.94
  5. Step 5: Solve for x
    x = 152,603,738.94/13,134.78
  6. Step 6: Final answer
    x = 11,618.29

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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.