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Finding the Fourth Proportional to 491.27, 678.30 and 344.11

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Solution

The fourth proportional to 491.27, 678.30 and 344.11 is: 475.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.27 : 678.30 = 344.11 : x
  2. Step 2: Convert to fraction form
    491.27/678.30 = 344.11/x
  3. Step 3: Cross multiply
    491.27x = 678.30 × 344.11
  4. Step 4: Simplify right side
    491.27x = 233,407.16
  5. Step 5: Solve for x
    x = 233,407.16/491.27
  6. Step 6: Final answer
    x = 475.11

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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.