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Finding the Fourth Proportional to 849.15, 1,172.07 and 550.39

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Solution

The fourth proportional to 849.15, 1,172.07 and 550.39 is: 759.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.15 : 1,172.07 = 550.39 : x
  2. Step 2: Convert to fraction form
    849.15/1,172.07 = 550.39/x
  3. Step 3: Cross multiply
    849.15x = 1,172.07 × 550.39
  4. Step 4: Simplify right side
    849.15x = 645,094.74
  5. Step 5: Solve for x
    x = 645,094.74/849.15
  6. Step 6: Final answer
    x = 759.69

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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.