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Finding the Fourth Proportional to 455.51, 682.38 and 211.70

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Solution

The fourth proportional to 455.51, 682.38 and 211.70 is: 317.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.51 : 682.38 = 211.70 : x
  2. Step 2: Convert to fraction form
    455.51/682.38 = 211.70/x
  3. Step 3: Cross multiply
    455.51x = 682.38 × 211.70
  4. Step 4: Simplify right side
    455.51x = 144,456.43
  5. Step 5: Solve for x
    x = 144,456.43/455.51
  6. Step 6: Final answer
    x = 317.13

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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.