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Finding the Fourth Proportional to 13,618.40, 20,411.40 and 7,041.20

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Solution

The fourth proportional to 13,618.40, 20,411.40 and 7,041.20 is: 10,553.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,618.40 : 20,411.40 = 7,041.20 : x
  2. Step 2: Convert to fraction form
    13,618.40/20,411.40 = 7,041.20/x
  3. Step 3: Cross multiply
    13,618.40x = 20,411.40 × 7,041.20
  4. Step 4: Simplify right side
    13,618.40x = 143,720,749.68
  5. Step 5: Solve for x
    x = 143,720,749.68/13,618.40
  6. Step 6: Final answer
    x = 10,553.42

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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.