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Finding the Fourth Proportional to 2,172.54, 3,258.80 and 785.87

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Solution

The fourth proportional to 2,172.54, 3,258.80 and 785.87 is: 1,178.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.54 : 3,258.80 = 785.87 : x
  2. Step 2: Convert to fraction form
    2,172.54/3,258.80 = 785.87/x
  3. Step 3: Cross multiply
    2,172.54x = 3,258.80 × 785.87
  4. Step 4: Simplify right side
    2,172.54x = 2,560,992.52
  5. Step 5: Solve for x
    x = 2,560,992.52/2,172.54
  6. Step 6: Final answer
    x = 1,178.80

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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.