Home / 1,431.66-2,149.92-858.18

Finding the Fourth Proportional to 1,431.66, 2,149.92 and 858.18

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Solution

The fourth proportional to 1,431.66, 2,149.92 and 858.18 is: 1,288.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.66 : 2,149.92 = 858.18 : x
  2. Step 2: Convert to fraction form
    1,431.66/2,149.92 = 858.18/x
  3. Step 3: Cross multiply
    1,431.66x = 2,149.92 × 858.18
  4. Step 4: Simplify right side
    1,431.66x = 1,845,018.35
  5. Step 5: Solve for x
    x = 1,845,018.35/1,431.66
  6. Step 6: Final answer
    x = 1,288.73

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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.