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Finding the Fourth Proportional to 849.51, 1,272.81 and 664.34

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Solution

The fourth proportional to 849.51, 1,272.81 and 664.34 is: 995.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.51 : 1,272.81 = 664.34 : x
  2. Step 2: Convert to fraction form
    849.51/1,272.81 = 664.34/x
  3. Step 3: Cross multiply
    849.51x = 1,272.81 × 664.34
  4. Step 4: Simplify right side
    849.51x = 845,579.39
  5. Step 5: Solve for x
    x = 845,579.39/849.51
  6. Step 6: Final answer
    x = 995.38

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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.