Home / 13,428.63-20,139.91-5,105.68

Finding the Fourth Proportional to 13,428.63, 20,139.91 and 5,105.68

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Solution

The fourth proportional to 13,428.63, 20,139.91 and 5,105.68 is: 7,657.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,428.63 : 20,139.91 = 5,105.68 : x
  2. Step 2: Convert to fraction form
    13,428.63/20,139.91 = 5,105.68/x
  3. Step 3: Cross multiply
    13,428.63x = 20,139.91 × 5,105.68
  4. Step 4: Simplify right side
    13,428.63x = 102,827,872.57
  5. Step 5: Solve for x
    x = 102,827,872.57/13,428.63
  6. Step 6: Final answer
    x = 7,657.36

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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.