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Finding the Fourth Proportional to 20,615.34, 28,439 and 13,892.34

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Solution

The fourth proportional to 20,615.34, 28,439 and 13,892.34 is: 19,164.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.34 : 28,439 = 13,892.34 : x
  2. Step 2: Convert to fraction form
    20,615.34/28,439 = 13,892.34/x
  3. Step 3: Cross multiply
    20,615.34x = 28,439 × 13,892.34
  4. Step 4: Simplify right side
    20,615.34x = 395,084,257.26
  5. Step 5: Solve for x
    x = 395,084,257.26/20,615.34
  6. Step 6: Final answer
    x = 19,164.58

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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.