Home / 20,420.73-28,138.32-15,640.38

Finding the Fourth Proportional to 20,420.73, 28,138.32 and 15,640.38

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Solution

The fourth proportional to 20,420.73, 28,138.32 and 15,640.38 is: 21,551.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,420.73 : 28,138.32 = 15,640.38 : x
  2. Step 2: Convert to fraction form
    20,420.73/28,138.32 = 15,640.38/x
  3. Step 3: Cross multiply
    20,420.73x = 28,138.32 × 15,640.38
  4. Step 4: Simplify right side
    20,420.73x = 440,094,017.36
  5. Step 5: Solve for x
    x = 440,094,017.36/20,420.73
  6. Step 6: Final answer
    x = 21,551.34

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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.