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Finding the Fourth Proportional to 678.65, 1,017.11 and 369.86

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Solution

The fourth proportional to 678.65, 1,017.11 and 369.86 is: 554.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.65 : 1,017.11 = 369.86 : x
  2. Step 2: Convert to fraction form
    678.65/1,017.11 = 369.86/x
  3. Step 3: Cross multiply
    678.65x = 1,017.11 × 369.86
  4. Step 4: Simplify right side
    678.65x = 376,181.37
  5. Step 5: Solve for x
    x = 376,181.37/678.65
  6. Step 6: Final answer
    x = 554.31

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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.