Home / 20,130.05-27,778.55-11,178.12

Finding the Fourth Proportional to 20,130.05, 27,778.55 and 11,178.12

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Solution

The fourth proportional to 20,130.05, 27,778.55 and 11,178.12 is: 15,425.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.05 : 27,778.55 = 11,178.12 : x
  2. Step 2: Convert to fraction form
    20,130.05/27,778.55 = 11,178.12/x
  3. Step 3: Cross multiply
    20,130.05x = 27,778.55 × 11,178.12
  4. Step 4: Simplify right side
    20,130.05x = 310,512,013.60
  5. Step 5: Solve for x
    x = 310,512,013.60/20,130.05
  6. Step 6: Final answer
    x = 15,425.30

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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.