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Finding the Fourth Proportional to 15,208.89, 20,987.28 and 8,494.20

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Solution

The fourth proportional to 15,208.89, 20,987.28 and 8,494.20 is: 11,721.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,208.89 : 20,987.28 = 8,494.20 : x
  2. Step 2: Convert to fraction form
    15,208.89/20,987.28 = 8,494.20/x
  3. Step 3: Cross multiply
    15,208.89x = 20,987.28 × 8,494.20
  4. Step 4: Simplify right side
    15,208.89x = 178,270,153.78
  5. Step 5: Solve for x
    x = 178,270,153.78/15,208.89
  6. Step 6: Final answer
    x = 11,721.44

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Double scale
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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.