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Finding the Fourth Proportional to 678.78, 936.99 and 513.03

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Solution

The fourth proportional to 678.78, 936.99 and 513.03 is: 708.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.78 : 936.99 = 513.03 : x
  2. Step 2: Convert to fraction form
    678.78/936.99 = 513.03/x
  3. Step 3: Cross multiply
    678.78x = 936.99 × 513.03
  4. Step 4: Simplify right side
    678.78x = 480,703.98
  5. Step 5: Solve for x
    x = 480,703.98/678.78
  6. Step 6: Final answer
    x = 708.19

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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.