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Finding the Fourth Proportional to 678, 935.72 and 402

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Solution

The fourth proportional to 678, 935.72 and 402 is: 554.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 935.72 = 402 : x
  2. Step 2: Convert to fraction form
    678/935.72 = 402/x
  3. Step 3: Cross multiply
    678x = 935.72 × 402
  4. Step 4: Simplify right side
    678x = 376,159.44
  5. Step 5: Solve for x
    x = 376,159.44/678
  6. Step 6: Final answer
    x = 554.81

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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.