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Finding the Fourth Proportional to 2,259.75, 3,389.69 and 720.75

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Solution

The fourth proportional to 2,259.75, 3,389.69 and 720.75 is: 1,081.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,259.75 : 3,389.69 = 720.75 : x
  2. Step 2: Convert to fraction form
    2,259.75/3,389.69 = 720.75/x
  3. Step 3: Cross multiply
    2,259.75x = 3,389.69 × 720.75
  4. Step 4: Simplify right side
    2,259.75x = 2,443,115.46
  5. Step 5: Solve for x
    x = 2,443,115.46/2,259.75
  6. Step 6: Final answer
    x = 1,081.14

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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.