Home / 1,226.40-1,842.30-861.90

Finding the Fourth Proportional to 1,226.40, 1,842.30 and 861.90

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Solution

The fourth proportional to 1,226.40, 1,842.30 and 861.90 is: 1,294.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.40 : 1,842.30 = 861.90 : x
  2. Step 2: Convert to fraction form
    1,226.40/1,842.30 = 861.90/x
  3. Step 3: Cross multiply
    1,226.40x = 1,842.30 × 861.90
  4. Step 4: Simplify right side
    1,226.40x = 1,587,878.37
  5. Step 5: Solve for x
    x = 1,587,878.37/1,226.40
  6. Step 6: Final answer
    x = 1,294.75

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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.