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Finding the Fourth Proportional to 678.94, 1,017.60 and 262.19

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Solution

The fourth proportional to 678.94, 1,017.60 and 262.19 is: 392.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.94 : 1,017.60 = 262.19 : x
  2. Step 2: Convert to fraction form
    678.94/1,017.60 = 262.19/x
  3. Step 3: Cross multiply
    678.94x = 1,017.60 × 262.19
  4. Step 4: Simplify right side
    678.94x = 266,804.54
  5. Step 5: Solve for x
    x = 266,804.54/678.94
  6. Step 6: Final answer
    x = 392.97

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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.