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Finding the Fourth Proportional to 491.23, 677.89 and 281.40

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Solution

The fourth proportional to 491.23, 677.89 and 281.40 is: 388.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.23 : 677.89 = 281.40 : x
  2. Step 2: Convert to fraction form
    491.23/677.89 = 281.40/x
  3. Step 3: Cross multiply
    491.23x = 677.89 × 281.40
  4. Step 4: Simplify right side
    491.23x = 190,756.84
  5. Step 5: Solve for x
    x = 190,756.84/491.23
  6. Step 6: Final answer
    x = 388.33

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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.