Home / 1,520.21-2,097.87-857.04

Finding the Fourth Proportional to 1,520.21, 2,097.87 and 857.04

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Solution

The fourth proportional to 1,520.21, 2,097.87 and 857.04 is: 1,182.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.21 : 2,097.87 = 857.04 : x
  2. Step 2: Convert to fraction form
    1,520.21/2,097.87 = 857.04/x
  3. Step 3: Cross multiply
    1,520.21x = 2,097.87 × 857.04
  4. Step 4: Simplify right side
    1,520.21x = 1,797,958.50
  5. Step 5: Solve for x
    x = 1,797,958.50/1,520.21
  6. Step 6: Final answer
    x = 1,182.71

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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.