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Finding the Fourth Proportional to 491.81, 678.74 and 344.80

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Solution

The fourth proportional to 491.81, 678.74 and 344.80 is: 475.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.81 : 678.74 = 344.80 : x
  2. Step 2: Convert to fraction form
    491.81/678.74 = 344.80/x
  3. Step 3: Cross multiply
    491.81x = 678.74 × 344.80
  4. Step 4: Simplify right side
    491.81x = 234,028.72
  5. Step 5: Solve for x
    x = 234,028.72/491.81
  6. Step 6: Final answer
    x = 475.85

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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.