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Finding the Fourth Proportional to 678, 935.78 and 383.28

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Solution

The fourth proportional to 678, 935.78 and 383.28 is: 529.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 935.78 = 383.28 : x
  2. Step 2: Convert to fraction form
    678/935.78 = 383.28/x
  3. Step 3: Cross multiply
    678x = 935.78 × 383.28
  4. Step 4: Simplify right side
    678x = 358,665.76
  5. Step 5: Solve for x
    x = 358,665.76/678
  6. Step 6: Final answer
    x = 529.01

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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.