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Finding the Fourth Proportional to 678.55, 936.41 and 383.82

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Solution

The fourth proportional to 678.55, 936.41 and 383.82 is: 529.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.55 : 936.41 = 383.82 : x
  2. Step 2: Convert to fraction form
    678.55/936.41 = 383.82/x
  3. Step 3: Cross multiply
    678.55x = 936.41 × 383.82
  4. Step 4: Simplify right side
    678.55x = 359,412.89
  5. Step 5: Solve for x
    x = 359,412.89/678.55
  6. Step 6: Final answer
    x = 529.68

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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.