Home / 20,128.78-27,778.62-11,176.40

Finding the Fourth Proportional to 20,128.78, 27,778.62 and 11,176.40

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Solution

The fourth proportional to 20,128.78, 27,778.62 and 11,176.40 is: 15,423.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.78 : 27,778.62 = 11,176.40 : x
  2. Step 2: Convert to fraction form
    20,128.78/27,778.62 = 11,176.40/x
  3. Step 3: Cross multiply
    20,128.78x = 27,778.62 × 11,176.40
  4. Step 4: Simplify right side
    20,128.78x = 310,464,968.57
  5. Step 5: Solve for x
    x = 310,464,968.57/20,128.78
  6. Step 6: Final answer
    x = 15,423.93

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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.