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Finding the Fourth Proportional to 2,172.06, 3,257.28 and 785.06

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Solution

The fourth proportional to 2,172.06, 3,257.28 and 785.06 is: 1,177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.06 : 3,257.28 = 785.06 : x
  2. Step 2: Convert to fraction form
    2,172.06/3,257.28 = 785.06/x
  3. Step 3: Cross multiply
    2,172.06x = 3,257.28 × 785.06
  4. Step 4: Simplify right side
    2,172.06x = 2,557,160.24
  5. Step 5: Solve for x
    x = 2,557,160.24/2,172.06
  6. Step 6: Final answer
    x = 1,177.30

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1.5x scale

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.