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Finding the Fourth Proportional to 491.31, 677.94 and 281.46

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Solution

The fourth proportional to 491.31, 677.94 and 281.46 is: 388.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.31 : 677.94 = 281.46 : x
  2. Step 2: Convert to fraction form
    491.31/677.94 = 281.46/x
  3. Step 3: Cross multiply
    491.31x = 677.94 × 281.46
  4. Step 4: Simplify right side
    491.31x = 190,812.99
  5. Step 5: Solve for x
    x = 190,812.99/491.31
  6. Step 6: Final answer
    x = 388.38

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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.