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Finding the Fourth Proportional to 2,172.53, 3,258.36 and 612.61

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Solution

The fourth proportional to 2,172.53, 3,258.36 and 612.61 is: 918.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.53 : 3,258.36 = 612.61 : x
  2. Step 2: Convert to fraction form
    2,172.53/3,258.36 = 612.61/x
  3. Step 3: Cross multiply
    2,172.53x = 3,258.36 × 612.61
  4. Step 4: Simplify right side
    2,172.53x = 1,996,103.92
  5. Step 5: Solve for x
    x = 1,996,103.92/2,172.53
  6. Step 6: Final answer
    x = 918.79

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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.