Home / 1,679.12-2,520.24-857.98

Finding the Fourth Proportional to 1,679.12, 2,520.24 and 857.98

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Solution

The fourth proportional to 1,679.12, 2,520.24 and 857.98 is: 1,287.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.12 : 2,520.24 = 857.98 : x
  2. Step 2: Convert to fraction form
    1,679.12/2,520.24 = 857.98/x
  3. Step 3: Cross multiply
    1,679.12x = 2,520.24 × 857.98
  4. Step 4: Simplify right side
    1,679.12x = 2,162,309.21
  5. Step 5: Solve for x
    x = 2,162,309.21/1,679.12
  6. Step 6: Final answer
    x = 1,287.77

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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.