Home / 1,245.11-1,868-1,109.09

Finding the Fourth Proportional to 1,245.11, 1,868 and 1,109.09

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Solution

The fourth proportional to 1,245.11, 1,868 and 1,109.09 is: 1,663.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.11 : 1,868 = 1,109.09 : x
  2. Step 2: Convert to fraction form
    1,245.11/1,868 = 1,109.09/x
  3. Step 3: Cross multiply
    1,245.11x = 1,868 × 1,109.09
  4. Step 4: Simplify right side
    1,245.11x = 2,071,780.12
  5. Step 5: Solve for x
    x = 2,071,780.12/1,245.11
  6. Step 6: Final answer
    x = 1,663.93

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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.