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Finding the Fourth Proportional to 849.42, 1,272.06 and 415.50

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Solution

The fourth proportional to 849.42, 1,272.06 and 415.50 is: 622.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.42 : 1,272.06 = 415.50 : x
  2. Step 2: Convert to fraction form
    849.42/1,272.06 = 415.50/x
  3. Step 3: Cross multiply
    849.42x = 1,272.06 × 415.50
  4. Step 4: Simplify right side
    849.42x = 528,540.93
  5. Step 5: Solve for x
    x = 528,540.93/849.42
  6. Step 6: Final answer
    x = 622.24

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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.