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Finding the Fourth Proportional to 13,707.38, 18,916.18 and 7,419.75

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Solution

The fourth proportional to 13,707.38, 18,916.18 and 7,419.75 is: 10,239.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,707.38 : 18,916.18 = 7,419.75 : x
  2. Step 2: Convert to fraction form
    13,707.38/18,916.18 = 7,419.75/x
  3. Step 3: Cross multiply
    13,707.38x = 18,916.18 × 7,419.75
  4. Step 4: Simplify right side
    13,707.38x = 140,353,326.56
  5. Step 5: Solve for x
    x = 140,353,326.56/13,707.38
  6. Step 6: Final answer
    x = 10,239.25

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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.