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Finding the Fourth Proportional to 353, 487.42 and 279.70

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Solution

The fourth proportional to 353, 487.42 and 279.70 is: 386.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    353 : 487.42 = 279.70 : x
  2. Step 2: Convert to fraction form
    353/487.42 = 279.70/x
  3. Step 3: Cross multiply
    353x = 487.42 × 279.70
  4. Step 4: Simplify right side
    353x = 136,331.37
  5. Step 5: Solve for x
    x = 136,331.37/353
  6. Step 6: Final answer
    x = 386.21

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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.