Home / 10,991.03-15,174.10-7,220.78

Finding the Fourth Proportional to 10,991.03, 15,174.10 and 7,220.78

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Solution

The fourth proportional to 10,991.03, 15,174.10 and 7,220.78 is: 9,968.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,991.03 : 15,174.10 = 7,220.78 : x
  2. Step 2: Convert to fraction form
    10,991.03/15,174.10 = 7,220.78/x
  3. Step 3: Cross multiply
    10,991.03x = 15,174.10 × 7,220.78
  4. Step 4: Simplify right side
    10,991.03x = 109,568,827.86
  5. Step 5: Solve for x
    x = 109,568,827.86/10,991.03
  6. Step 6: Final answer
    x = 9,968.94

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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.