Home / 20,388.80-28,150.08-15,664.64

Finding the Fourth Proportional to 20,388.80, 28,150.08 and 15,664.64

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Solution

The fourth proportional to 20,388.80, 28,150.08 and 15,664.64 is: 21,627.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.80 : 28,150.08 = 15,664.64 : x
  2. Step 2: Convert to fraction form
    20,388.80/28,150.08 = 15,664.64/x
  3. Step 3: Cross multiply
    20,388.80x = 28,150.08 × 15,664.64
  4. Step 4: Simplify right side
    20,388.80x = 440,960,869.17
  5. Step 5: Solve for x
    x = 440,960,869.17/20,388.80
  6. Step 6: Final answer
    x = 21,627.60

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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.