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Finding the Fourth Proportional to 2,159.75, 3,239.01 and 698.51

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Solution

The fourth proportional to 2,159.75, 3,239.01 and 698.51 is: 1,047.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,159.75 : 3,239.01 = 698.51 : x
  2. Step 2: Convert to fraction form
    2,159.75/3,239.01 = 698.51/x
  3. Step 3: Cross multiply
    2,159.75x = 3,239.01 × 698.51
  4. Step 4: Simplify right side
    2,159.75x = 2,262,464.68
  5. Step 5: Solve for x
    x = 2,262,464.68/2,159.75
  6. Step 6: Final answer
    x = 1,047.56

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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.