Home / 1,556.20-2,147.40-857.56

Finding the Fourth Proportional to 1,556.20, 2,147.40 and 857.56

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Solution

The fourth proportional to 1,556.20, 2,147.40 and 857.56 is: 1,183.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,556.20 : 2,147.40 = 857.56 : x
  2. Step 2: Convert to fraction form
    1,556.20/2,147.40 = 857.56/x
  3. Step 3: Cross multiply
    1,556.20x = 2,147.40 × 857.56
  4. Step 4: Simplify right side
    1,556.20x = 1,841,524.34
  5. Step 5: Solve for x
    x = 1,841,524.34/1,556.20
  6. Step 6: Final answer
    x = 1,183.35

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1.5x scale

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.