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Finding the Fourth Proportional to 678.46, 936.34 and 383.74

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Solution

The fourth proportional to 678.46, 936.34 and 383.74 is: 529.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.46 : 936.34 = 383.74 : x
  2. Step 2: Convert to fraction form
    678.46/936.34 = 383.74/x
  3. Step 3: Cross multiply
    678.46x = 936.34 × 383.74
  4. Step 4: Simplify right side
    678.46x = 359,311.11
  5. Step 5: Solve for x
    x = 359,311.11/678.46
  6. Step 6: Final answer
    x = 529.60

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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.