Home / 13,121.84-18,107.78-7,153.63

Finding the Fourth Proportional to 13,121.84, 18,107.78 and 7,153.63

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Solution

The fourth proportional to 13,121.84, 18,107.78 and 7,153.63 is: 9,871.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.84 : 18,107.78 = 7,153.63 : x
  2. Step 2: Convert to fraction form
    13,121.84/18,107.78 = 7,153.63/x
  3. Step 3: Cross multiply
    13,121.84x = 18,107.78 × 7,153.63
  4. Step 4: Simplify right side
    13,121.84x = 129,536,358.24
  5. Step 5: Solve for x
    x = 129,536,358.24/13,121.84
  6. Step 6: Final answer
    x = 9,871.81

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Double scale
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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.