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Finding the Fourth Proportional to 13,708.69, 18,917.96 and 7,421.07

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Solution

The fourth proportional to 13,708.69, 18,917.96 and 7,421.07 is: 10,241.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.69 : 18,917.96 = 7,421.07 : x
  2. Step 2: Convert to fraction form
    13,708.69/18,917.96 = 7,421.07/x
  3. Step 3: Cross multiply
    13,708.69x = 18,917.96 × 7,421.07
  4. Step 4: Simplify right side
    13,708.69x = 140,391,505.42
  5. Step 5: Solve for x
    x = 140,391,505.42/13,708.69
  6. Step 6: Final answer
    x = 10,241.06

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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.