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Finding the Fourth Proportional to 678.06, 1,016.31 and 369.23

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Solution

The fourth proportional to 678.06, 1,016.31 and 369.23 is: 553.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.06 : 1,016.31 = 369.23 : x
  2. Step 2: Convert to fraction form
    678.06/1,016.31 = 369.23/x
  3. Step 3: Cross multiply
    678.06x = 1,016.31 × 369.23
  4. Step 4: Simplify right side
    678.06x = 375,248.44
  5. Step 5: Solve for x
    x = 375,248.44/678.06
  6. Step 6: Final answer
    x = 553.41

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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.