Home / 13,121.69-18,107.84-7,153.34

Finding the Fourth Proportional to 13,121.69, 18,107.84 and 7,153.34

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Solution

The fourth proportional to 13,121.69, 18,107.84 and 7,153.34 is: 9,871.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.69 : 18,107.84 = 7,153.34 : x
  2. Step 2: Convert to fraction form
    13,121.69/18,107.84 = 7,153.34/x
  3. Step 3: Cross multiply
    13,121.69x = 18,107.84 × 7,153.34
  4. Step 4: Simplify right side
    13,121.69x = 129,531,500.42
  5. Step 5: Solve for x
    x = 129,531,500.42/13,121.69
  6. Step 6: Final answer
    x = 9,871.56

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Half scale
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Double scale
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Similar ratio
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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.