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Finding the Fourth Proportional to 13,619.54, 20,418.93 and 7,041.53

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Solution

The fourth proportional to 13,619.54, 20,418.93 and 7,041.53 is: 10,556.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,619.54 : 20,418.93 = 7,041.53 : x
  2. Step 2: Convert to fraction form
    13,619.54/20,418.93 = 7,041.53/x
  3. Step 3: Cross multiply
    13,619.54x = 20,418.93 × 7,041.53
  4. Step 4: Simplify right side
    13,619.54x = 143,780,508.16
  5. Step 5: Solve for x
    x = 143,780,508.16/13,619.54
  6. Step 6: Final answer
    x = 10,556.93

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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.