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Finding the Fourth Proportional to 491.25, 678.23 and 343.63

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Solution

The fourth proportional to 491.25, 678.23 and 343.63 is: 474.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.25 : 678.23 = 343.63 : x
  2. Step 2: Convert to fraction form
    491.25/678.23 = 343.63/x
  3. Step 3: Cross multiply
    491.25x = 678.23 × 343.63
  4. Step 4: Simplify right side
    491.25x = 233,060.17
  5. Step 5: Solve for x
    x = 233,060.17/491.25
  6. Step 6: Final answer
    x = 474.42

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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.