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Finding the Fourth Proportional to 1,204.91, 1,809.42 and 745.40

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Solution

The fourth proportional to 1,204.91, 1,809.42 and 745.40 is: 1,119.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,204.91 : 1,809.42 = 745.40 : x
  2. Step 2: Convert to fraction form
    1,204.91/1,809.42 = 745.40/x
  3. Step 3: Cross multiply
    1,204.91x = 1,809.42 × 745.40
  4. Step 4: Simplify right side
    1,204.91x = 1,348,741.67
  5. Step 5: Solve for x
    x = 1,348,741.67/1,204.91
  6. Step 6: Final answer
    x = 1,119.37

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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.