Home / 1,231.15-1,698.57-789.30

Finding the Fourth Proportional to 1,231.15, 1,698.57 and 789.30

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Solution

The fourth proportional to 1,231.15, 1,698.57 and 789.30 is: 1,088.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.15 : 1,698.57 = 789.30 : x
  2. Step 2: Convert to fraction form
    1,231.15/1,698.57 = 789.30/x
  3. Step 3: Cross multiply
    1,231.15x = 1,698.57 × 789.30
  4. Step 4: Simplify right side
    1,231.15x = 1,340,681.30
  5. Step 5: Solve for x
    x = 1,340,681.30/1,231.15
  6. Step 6: Final answer
    x = 1,088.97

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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.