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Finding the Fourth Proportional to 352.50, 485.90 and 282.45

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Solution

The fourth proportional to 352.50, 485.90 and 282.45 is: 389.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.50 : 485.90 = 282.45 : x
  2. Step 2: Convert to fraction form
    352.50/485.90 = 282.45/x
  3. Step 3: Cross multiply
    352.50x = 485.90 × 282.45
  4. Step 4: Simplify right side
    352.50x = 137,241.04
  5. Step 5: Solve for x
    x = 137,241.04/352.50
  6. Step 6: Final answer
    x = 389.34

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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.