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Finding the Fourth Proportional to 13,603.78, 20,420.25 and 7,028.20

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Solution

The fourth proportional to 13,603.78, 20,420.25 and 7,028.20 is: 10,549.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.78 : 20,420.25 = 7,028.20 : x
  2. Step 2: Convert to fraction form
    13,603.78/20,420.25 = 7,028.20/x
  3. Step 3: Cross multiply
    13,603.78x = 20,420.25 × 7,028.20
  4. Step 4: Simplify right side
    13,603.78x = 143,517,601.05
  5. Step 5: Solve for x
    x = 143,517,601.05/13,603.78
  6. Step 6: Final answer
    x = 10,549.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.