Home / 20,615.36-28,439-13,892.36

Finding the Fourth Proportional to 20,615.36, 28,439 and 13,892.36

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Solution

The fourth proportional to 20,615.36, 28,439 and 13,892.36 is: 19,164.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.36 : 28,439 = 13,892.36 : x
  2. Step 2: Convert to fraction form
    20,615.36/28,439 = 13,892.36/x
  3. Step 3: Cross multiply
    20,615.36x = 28,439 × 13,892.36
  4. Step 4: Simplify right side
    20,615.36x = 395,084,826.04
  5. Step 5: Solve for x
    x = 395,084,826.04/20,615.36
  6. Step 6: Final answer
    x = 19,164.59

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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.