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Finding the Fourth Proportional to 352.40, 485.20 and 299.84

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Solution

The fourth proportional to 352.40, 485.20 and 299.84 is: 412.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.40 : 485.20 = 299.84 : x
  2. Step 2: Convert to fraction form
    352.40/485.20 = 299.84/x
  3. Step 3: Cross multiply
    352.40x = 485.20 × 299.84
  4. Step 4: Simplify right side
    352.40x = 145,482.37
  5. Step 5: Solve for x
    x = 145,482.37/352.40
  6. Step 6: Final answer
    x = 412.83

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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.