Home / 1,406.20-2,107.72-857.18

Finding the Fourth Proportional to 1,406.20, 2,107.72 and 857.18

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Solution

The fourth proportional to 1,406.20, 2,107.72 and 857.18 is: 1,284.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.20 : 2,107.72 = 857.18 : x
  2. Step 2: Convert to fraction form
    1,406.20/2,107.72 = 857.18/x
  3. Step 3: Cross multiply
    1,406.20x = 2,107.72 × 857.18
  4. Step 4: Simplify right side
    1,406.20x = 1,806,695.43
  5. Step 5: Solve for x
    x = 1,806,695.43/1,406.20
  6. Step 6: Final answer
    x = 1,284.81

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1.5x scale

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.