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Finding the Fourth Proportional to 680.01, 1,019.70 and 211.43

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Solution

The fourth proportional to 680.01, 1,019.70 and 211.43 is: 317.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.01 : 1,019.70 = 211.43 : x
  2. Step 2: Convert to fraction form
    680.01/1,019.70 = 211.43/x
  3. Step 3: Cross multiply
    680.01x = 1,019.70 × 211.43
  4. Step 4: Simplify right side
    680.01x = 215,590.07
  5. Step 5: Solve for x
    x = 215,590.07/680.01
  6. Step 6: Final answer
    x = 317.04

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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.