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Finding the Fourth Proportional to 685.22, 945.48 and 401.54

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Solution

The fourth proportional to 685.22, 945.48 and 401.54 is: 554.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.22 : 945.48 = 401.54 : x
  2. Step 2: Convert to fraction form
    685.22/945.48 = 401.54/x
  3. Step 3: Cross multiply
    685.22x = 945.48 × 401.54
  4. Step 4: Simplify right side
    685.22x = 379,643.31
  5. Step 5: Solve for x
    x = 379,643.31/685.22
  6. Step 6: Final answer
    x = 554.05

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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.