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Finding the Fourth Proportional to 13,689.99, 20,537.20 and 5,365.49

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Solution

The fourth proportional to 13,689.99, 20,537.20 and 5,365.49 is: 8,049.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.99 : 20,537.20 = 5,365.49 : x
  2. Step 2: Convert to fraction form
    13,689.99/20,537.20 = 5,365.49/x
  3. Step 3: Cross multiply
    13,689.99x = 20,537.20 × 5,365.49
  4. Step 4: Simplify right side
    13,689.99x = 110,192,127.81
  5. Step 5: Solve for x
    x = 110,192,127.81/13,689.99
  6. Step 6: Final answer
    x = 8,049.10

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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.