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Finding the Fourth Proportional to 279.98, 386.46 and 217.70

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Solution

The fourth proportional to 279.98, 386.46 and 217.70 is: 300.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.98 : 386.46 = 217.70 : x
  2. Step 2: Convert to fraction form
    279.98/386.46 = 217.70/x
  3. Step 3: Cross multiply
    279.98x = 386.46 × 217.70
  4. Step 4: Simplify right side
    279.98x = 84,132.34
  5. Step 5: Solve for x
    x = 84,132.34/279.98
  6. Step 6: Final answer
    x = 300.49

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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.