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Finding the Fourth Proportional to 698.70, 1,047.99 and 211.80

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Solution

The fourth proportional to 698.70, 1,047.99 and 211.80 is: 317.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.70 : 1,047.99 = 211.80 : x
  2. Step 2: Convert to fraction form
    698.70/1,047.99 = 211.80/x
  3. Step 3: Cross multiply
    698.70x = 1,047.99 × 211.80
  4. Step 4: Simplify right side
    698.70x = 221,964.28
  5. Step 5: Solve for x
    x = 221,964.28/698.70
  6. Step 6: Final answer
    x = 317.68

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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.