Home / 1,427.22-2,140.97-686.61

Finding the Fourth Proportional to 1,427.22, 2,140.97 and 686.61

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Solution

The fourth proportional to 1,427.22, 2,140.97 and 686.61 is: 1,029.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.22 : 2,140.97 = 686.61 : x
  2. Step 2: Convert to fraction form
    1,427.22/2,140.97 = 686.61/x
  3. Step 3: Cross multiply
    1,427.22x = 2,140.97 × 686.61
  4. Step 4: Simplify right side
    1,427.22x = 1,470,007.98
  5. Step 5: Solve for x
    x = 1,470,007.98/1,427.22
  6. Step 6: Final answer
    x = 1,029.98

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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.