Home / 20,365.11-28,120.97-15,320.58

Finding the Fourth Proportional to 20,365.11, 28,120.97 and 15,320.58

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Solution

The fourth proportional to 20,365.11, 28,120.97 and 15,320.58 is: 21,155.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,365.11 : 28,120.97 = 15,320.58 : x
  2. Step 2: Convert to fraction form
    20,365.11/28,120.97 = 15,320.58/x
  3. Step 3: Cross multiply
    20,365.11x = 28,120.97 × 15,320.58
  4. Step 4: Simplify right side
    20,365.11x = 430,829,493.96
  5. Step 5: Solve for x
    x = 430,829,493.96/20,365.11
  6. Step 6: Final answer
    x = 21,155.27

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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.