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Finding the Fourth Proportional to 678.75, 936.81 and 384.05

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Solution

The fourth proportional to 678.75, 936.81 and 384.05 is: 530.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.75 : 936.81 = 384.05 : x
  2. Step 2: Convert to fraction form
    678.75/936.81 = 384.05/x
  3. Step 3: Cross multiply
    678.75x = 936.81 × 384.05
  4. Step 4: Simplify right side
    678.75x = 359,777.20
  5. Step 5: Solve for x
    x = 359,777.20/678.75
  6. Step 6: Final answer
    x = 530.06

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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.