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Finding the Fourth Proportional to 353.70, 488.43 and 320.49

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Solution

The fourth proportional to 353.70, 488.43 and 320.49 is: 442.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.70 : 488.43 = 320.49 : x
  2. Step 2: Convert to fraction form
    353.70/488.43 = 320.49/x
  3. Step 3: Cross multiply
    353.70x = 488.43 × 320.49
  4. Step 4: Simplify right side
    353.70x = 156,536.93
  5. Step 5: Solve for x
    x = 156,536.93/353.70
  6. Step 6: Final answer
    x = 442.57

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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.