Home / 1,555.20-2,146.28-892.21

Finding the Fourth Proportional to 1,555.20, 2,146.28 and 892.21

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Solution

The fourth proportional to 1,555.20, 2,146.28 and 892.21 is: 1,231.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.20 : 2,146.28 = 892.21 : x
  2. Step 2: Convert to fraction form
    1,555.20/2,146.28 = 892.21/x
  3. Step 3: Cross multiply
    1,555.20x = 2,146.28 × 892.21
  4. Step 4: Simplify right side
    1,555.20x = 1,914,932.48
  5. Step 5: Solve for x
    x = 1,914,932.48/1,555.20
  6. Step 6: Final answer
    x = 1,231.31

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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.