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Finding the Fourth Proportional to 678.70, 936.72 and 384.07

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Solution

The fourth proportional to 678.70, 936.72 and 384.07 is: 530.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.70 : 936.72 = 384.07 : x
  2. Step 2: Convert to fraction form
    678.70/936.72 = 384.07/x
  3. Step 3: Cross multiply
    678.70x = 936.72 × 384.07
  4. Step 4: Simplify right side
    678.70x = 359,766.05
  5. Step 5: Solve for x
    x = 359,766.05/678.70
  6. Step 6: Final answer
    x = 530.08

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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.