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Finding the Fourth Proportional to 1,556.44, 2,147.90 and 857.81

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Solution

The fourth proportional to 1,556.44, 2,147.90 and 857.81 is: 1,183.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,556.44 : 2,147.90 = 857.81 : x
  2. Step 2: Convert to fraction form
    1,556.44/2,147.90 = 857.81/x
  3. Step 3: Cross multiply
    1,556.44x = 2,147.90 × 857.81
  4. Step 4: Simplify right side
    1,556.44x = 1,842,491.18
  5. Step 5: Solve for x
    x = 1,842,491.18/1,556.44
  6. Step 6: Final answer
    x = 1,183.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.