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Finding the Fourth Proportional to 20,280.88, 27,987.74 and 11,328.44

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Solution

The fourth proportional to 20,280.88, 27,987.74 and 11,328.44 is: 15,633.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.88 : 27,987.74 = 11,328.44 : x
  2. Step 2: Convert to fraction form
    20,280.88/27,987.74 = 11,328.44/x
  3. Step 3: Cross multiply
    20,280.88x = 27,987.74 × 11,328.44
  4. Step 4: Simplify right side
    20,280.88x = 317,057,433.33
  5. Step 5: Solve for x
    x = 317,057,433.33/20,280.88
  6. Step 6: Final answer
    x = 15,633.32

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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.