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Finding the Fourth Proportional to 20,361.29, 28,102.68 and 13,918.14

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Solution

The fourth proportional to 20,361.29, 28,102.68 and 13,918.14 is: 19,209.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,361.29 : 28,102.68 = 13,918.14 : x
  2. Step 2: Convert to fraction form
    20,361.29/28,102.68 = 13,918.14/x
  3. Step 3: Cross multiply
    20,361.29x = 28,102.68 × 13,918.14
  4. Step 4: Simplify right side
    20,361.29x = 391,137,034.62
  5. Step 5: Solve for x
    x = 391,137,034.62/20,361.29
  6. Step 6: Final answer
    x = 19,209.84

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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.