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Finding the Fourth Proportional to 675.19, 1,012.78 and 219.19

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Solution

The fourth proportional to 675.19, 1,012.78 and 219.19 is: 328.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.19 : 1,012.78 = 219.19 : x
  2. Step 2: Convert to fraction form
    675.19/1,012.78 = 219.19/x
  3. Step 3: Cross multiply
    675.19x = 1,012.78 × 219.19
  4. Step 4: Simplify right side
    675.19x = 221,988.99
  5. Step 5: Solve for x
    x = 221,988.99/675.19
  6. Step 6: Final answer
    x = 328.78

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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.