Home / 20,365.90-28,122.05-15,321.35

Finding the Fourth Proportional to 20,365.90, 28,122.05 and 15,321.35

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Solution

The fourth proportional to 20,365.90, 28,122.05 and 15,321.35 is: 21,156.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,365.90 : 28,122.05 = 15,321.35 : x
  2. Step 2: Convert to fraction form
    20,365.90/28,122.05 = 15,321.35/x
  3. Step 3: Cross multiply
    20,365.90x = 28,122.05 × 15,321.35
  4. Step 4: Simplify right side
    20,365.90x = 430,867,879.38
  5. Step 5: Solve for x
    x = 430,867,879.38/20,365.90
  6. Step 6: Final answer
    x = 21,156.34

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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.