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Finding the Fourth Proportional to 13,603.29, 20,361.19 and 7,020.51

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Solution

The fourth proportional to 13,603.29, 20,361.19 and 7,020.51 is: 10,508.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.29 : 20,361.19 = 7,020.51 : x
  2. Step 2: Convert to fraction form
    13,603.29/20,361.19 = 7,020.51/x
  3. Step 3: Cross multiply
    13,603.29x = 20,361.19 × 7,020.51
  4. Step 4: Simplify right side
    13,603.29x = 142,945,938.01
  5. Step 5: Solve for x
    x = 142,945,938.01/13,603.29
  6. Step 6: Final answer
    x = 10,508.19

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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.