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Finding the Fourth Proportional to 678.62, 936.48 and 383.89

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Solution

The fourth proportional to 678.62, 936.48 and 383.89 is: 529.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.62 : 936.48 = 383.89 : x
  2. Step 2: Convert to fraction form
    678.62/936.48 = 383.89/x
  3. Step 3: Cross multiply
    678.62x = 936.48 × 383.89
  4. Step 4: Simplify right side
    678.62x = 359,505.31
  5. Step 5: Solve for x
    x = 359,505.31/678.62
  6. Step 6: Final answer
    x = 529.76

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