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Finding the Fourth Proportional to 15,102.78, 20,844.36 and 8,815.20

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Solution

The fourth proportional to 15,102.78, 20,844.36 and 8,815.20 is: 12,166.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,102.78 : 20,844.36 = 8,815.20 : x
  2. Step 2: Convert to fraction form
    15,102.78/20,844.36 = 8,815.20/x
  3. Step 3: Cross multiply
    15,102.78x = 20,844.36 × 8,815.20
  4. Step 4: Simplify right side
    15,102.78x = 183,747,202.27
  5. Step 5: Solve for x
    x = 183,747,202.27/15,102.78
  6. Step 6: Final answer
    x = 12,166.45

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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.