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Finding the Fourth Proportional to 491.90, 678.39 and 295.34

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Solution

The fourth proportional to 491.90, 678.39 and 295.34 is: 407.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.90 : 678.39 = 295.34 : x
  2. Step 2: Convert to fraction form
    491.90/678.39 = 295.34/x
  3. Step 3: Cross multiply
    491.90x = 678.39 × 295.34
  4. Step 4: Simplify right side
    491.90x = 200,355.70
  5. Step 5: Solve for x
    x = 200,355.70/491.90
  6. Step 6: Final answer
    x = 407.31

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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.