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Finding the Fourth Proportional to 2,172.31, 3,258.11 and 612.42

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Solution

The fourth proportional to 2,172.31, 3,258.11 and 612.42 is: 918.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.31 : 3,258.11 = 612.42 : x
  2. Step 2: Convert to fraction form
    2,172.31/3,258.11 = 612.42/x
  3. Step 3: Cross multiply
    2,172.31x = 3,258.11 × 612.42
  4. Step 4: Simplify right side
    2,172.31x = 1,995,331.73
  5. Step 5: Solve for x
    x = 1,995,331.73/2,172.31
  6. Step 6: Final answer
    x = 918.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.