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Finding the Fourth Proportional to 279.60, 418.05 and 206.70

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Solution

The fourth proportional to 279.60, 418.05 and 206.70 is: 309.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.60 : 418.05 = 206.70 : x
  2. Step 2: Convert to fraction form
    279.60/418.05 = 206.70/x
  3. Step 3: Cross multiply
    279.60x = 418.05 × 206.70
  4. Step 4: Simplify right side
    279.60x = 86,410.94
  5. Step 5: Solve for x
    x = 86,410.94/279.60
  6. Step 6: Final answer
    x = 309.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.