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Finding the Fourth Proportional to 491.81, 678.39 and 295.28

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Solution

The fourth proportional to 491.81, 678.39 and 295.28 is: 407.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.81 : 678.39 = 295.28 : x
  2. Step 2: Convert to fraction form
    491.81/678.39 = 295.28/x
  3. Step 3: Cross multiply
    491.81x = 678.39 × 295.28
  4. Step 4: Simplify right side
    491.81x = 200,315.59
  5. Step 5: Solve for x
    x = 200,315.59/491.81
  6. Step 6: Final answer
    x = 407.30

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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.