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Finding the Fourth Proportional to 699.19, 1,048.79 and 212.24

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Solution

The fourth proportional to 699.19, 1,048.79 and 212.24 is: 318.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.19 : 1,048.79 = 212.24 : x
  2. Step 2: Convert to fraction form
    699.19/1,048.79 = 212.24/x
  3. Step 3: Cross multiply
    699.19x = 1,048.79 × 212.24
  4. Step 4: Simplify right side
    699.19x = 222,594.13
  5. Step 5: Solve for x
    x = 222,594.13/699.19
  6. Step 6: Final answer
    x = 318.36

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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.