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Finding the Fourth Proportional to 352.80, 487.14 and 309.60

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Solution

The fourth proportional to 352.80, 487.14 and 309.60 is: 427.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.80 : 487.14 = 309.60 : x
  2. Step 2: Convert to fraction form
    352.80/487.14 = 309.60/x
  3. Step 3: Cross multiply
    352.80x = 487.14 × 309.60
  4. Step 4: Simplify right side
    352.80x = 150,818.54
  5. Step 5: Solve for x
    x = 150,818.54/352.80
  6. Step 6: Final answer
    x = 427.49

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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.