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Finding the Fourth Proportional to 2,155, 3,232.56 and 694.28

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Solution

The fourth proportional to 2,155, 3,232.56 and 694.28 is: 1,041.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155 : 3,232.56 = 694.28 : x
  2. Step 2: Convert to fraction form
    2,155/3,232.56 = 694.28/x
  3. Step 3: Cross multiply
    2,155x = 3,232.56 × 694.28
  4. Step 4: Simplify right side
    2,155x = 2,244,301.76
  5. Step 5: Solve for x
    x = 2,244,301.76/2,155
  6. Step 6: Final answer
    x = 1,041.44

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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.