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Finding the Fourth Proportional to 13,419.54, 18,518.90 and 7,369.91

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Solution

The fourth proportional to 13,419.54, 18,518.90 and 7,369.91 is: 10,170.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,419.54 : 18,518.90 = 7,369.91 : x
  2. Step 2: Convert to fraction form
    13,419.54/18,518.90 = 7,369.91/x
  3. Step 3: Cross multiply
    13,419.54x = 18,518.90 × 7,369.91
  4. Step 4: Simplify right side
    13,419.54x = 136,482,496.85
  5. Step 5: Solve for x
    x = 136,482,496.85/13,419.54
  6. Step 6: Final answer
    x = 10,170.43

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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.