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Finding the Fourth Proportional to 678.35, 936.16 and 383.61

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Solution

The fourth proportional to 678.35, 936.16 and 383.61 is: 529.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.35 : 936.16 = 383.61 : x
  2. Step 2: Convert to fraction form
    678.35/936.16 = 383.61/x
  3. Step 3: Cross multiply
    678.35x = 936.16 × 383.61
  4. Step 4: Simplify right side
    678.35x = 359,123.64
  5. Step 5: Solve for x
    x = 359,123.64/678.35
  6. Step 6: Final answer
    x = 529.41

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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.