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Finding the Fourth Proportional to 678.09, 935.78 and 383.43

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Solution

The fourth proportional to 678.09, 935.78 and 383.43 is: 529.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.09 : 935.78 = 383.43 : x
  2. Step 2: Convert to fraction form
    678.09/935.78 = 383.43/x
  3. Step 3: Cross multiply
    678.09x = 935.78 × 383.43
  4. Step 4: Simplify right side
    678.09x = 358,807.72
  5. Step 5: Solve for x
    x = 358,807.72/678.09
  6. Step 6: Final answer
    x = 529.14

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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.