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Finding the Fourth Proportional to 678.38, 936.23 and 416.48

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Solution

The fourth proportional to 678.38, 936.23 and 416.48 is: 574.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.38 : 936.23 = 416.48 : x
  2. Step 2: Convert to fraction form
    678.38/936.23 = 416.48/x
  3. Step 3: Cross multiply
    678.38x = 936.23 × 416.48
  4. Step 4: Simplify right side
    678.38x = 389,914.31
  5. Step 5: Solve for x
    x = 389,914.31/678.38
  6. Step 6: Final answer
    x = 574.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.