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Finding the Fourth Proportional to 352.67, 485.48 and 305.40

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Solution

The fourth proportional to 352.67, 485.48 and 305.40 is: 420.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.67 : 485.48 = 305.40 : x
  2. Step 2: Convert to fraction form
    352.67/485.48 = 305.40/x
  3. Step 3: Cross multiply
    352.67x = 485.48 × 305.40
  4. Step 4: Simplify right side
    352.67x = 148,266.36
  5. Step 5: Solve for x
    x = 148,266.36/352.67
  6. Step 6: Final answer
    x = 420.41

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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.