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Finding the Fourth Proportional to 678.08, 1,016.44 and 388.92

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Solution

The fourth proportional to 678.08, 1,016.44 and 388.92 is: 582.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.08 : 1,016.44 = 388.92 : x
  2. Step 2: Convert to fraction form
    678.08/1,016.44 = 388.92/x
  3. Step 3: Cross multiply
    678.08x = 1,016.44 × 388.92
  4. Step 4: Simplify right side
    678.08x = 395,313.84
  5. Step 5: Solve for x
    x = 395,313.84/678.08
  6. Step 6: Final answer
    x = 582.99

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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.