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Finding the Fourth Proportional to 455.19, 682.80 and 211.70

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Solution

The fourth proportional to 455.19, 682.80 and 211.70 is: 317.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.19 : 682.80 = 211.70 : x
  2. Step 2: Convert to fraction form
    455.19/682.80 = 211.70/x
  3. Step 3: Cross multiply
    455.19x = 682.80 × 211.70
  4. Step 4: Simplify right side
    455.19x = 144,545.35
  5. Step 5: Solve for x
    x = 144,545.35/455.19
  6. Step 6: Final answer
    x = 317.55

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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.