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Finding the Fourth Proportional to 246.90, 340.65 and 221.70

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Solution

The fourth proportional to 246.90, 340.65 and 221.70 is: 305.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    246.90 : 340.65 = 221.70 : x
  2. Step 2: Convert to fraction form
    246.90/340.65 = 221.70/x
  3. Step 3: Cross multiply
    246.90x = 340.65 × 221.70
  4. Step 4: Simplify right side
    246.90x = 75,522.11
  5. Step 5: Solve for x
    x = 75,522.11/246.90
  6. Step 6: Final answer
    x = 305.88

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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.