Home / 13,121.81-18,107.39-7,532.81

Finding the Fourth Proportional to 13,121.81, 18,107.39 and 7,532.81

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Solution

The fourth proportional to 13,121.81, 18,107.39 and 7,532.81 is: 10,394.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.81 : 18,107.39 = 7,532.81 : x
  2. Step 2: Convert to fraction form
    13,121.81/18,107.39 = 7,532.81/x
  3. Step 3: Cross multiply
    13,121.81x = 18,107.39 × 7,532.81
  4. Step 4: Simplify right side
    13,121.81x = 136,399,490.80
  5. Step 5: Solve for x
    x = 136,399,490.80/13,121.81
  6. Step 6: Final answer
    x = 10,394.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.