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Finding the Fourth Proportional to 698.87, 1,048.29 and 212.26

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Solution

The fourth proportional to 698.87, 1,048.29 and 212.26 is: 318.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.87 : 1,048.29 = 212.26 : x
  2. Step 2: Convert to fraction form
    698.87/1,048.29 = 212.26/x
  3. Step 3: Cross multiply
    698.87x = 1,048.29 × 212.26
  4. Step 4: Simplify right side
    698.87x = 222,510.04
  5. Step 5: Solve for x
    x = 222,510.04/698.87
  6. Step 6: Final answer
    x = 318.39

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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.