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Finding the Fourth Proportional to 491.97, 678.71 and 305.33

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Solution

The fourth proportional to 491.97, 678.71 and 305.33 is: 421.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.97 : 678.71 = 305.33 : x
  2. Step 2: Convert to fraction form
    491.97/678.71 = 305.33/x
  3. Step 3: Cross multiply
    491.97x = 678.71 × 305.33
  4. Step 4: Simplify right side
    491.97x = 207,225.60
  5. Step 5: Solve for x
    x = 207,225.60/491.97
  6. Step 6: Final answer
    x = 421.22

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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.