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Finding the Fourth Proportional to 678.29, 936.09 and 383.58

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Solution

The fourth proportional to 678.29, 936.09 and 383.58 is: 529.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.29 : 936.09 = 383.58 : x
  2. Step 2: Convert to fraction form
    678.29/936.09 = 383.58/x
  3. Step 3: Cross multiply
    678.29x = 936.09 × 383.58
  4. Step 4: Simplify right side
    678.29x = 359,065.40
  5. Step 5: Solve for x
    x = 359,065.40/678.29
  6. Step 6: Final answer
    x = 529.37

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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.