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Finding the Fourth Proportional to 13,708.77, 18,918.16 and 7,421.15

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Solution

The fourth proportional to 13,708.77, 18,918.16 and 7,421.15 is: 10,241.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.77 : 18,918.16 = 7,421.15 : x
  2. Step 2: Convert to fraction form
    13,708.77/18,918.16 = 7,421.15/x
  3. Step 3: Cross multiply
    13,708.77x = 18,918.16 × 7,421.15
  4. Step 4: Simplify right side
    13,708.77x = 140,394,427.05
  5. Step 5: Solve for x
    x = 140,394,427.05/13,708.77
  6. Step 6: Final answer
    x = 10,241.21

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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.