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Finding the Fourth Proportional to 491.93, 678.85 and 281.96

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Solution

The fourth proportional to 491.93, 678.85 and 281.96 is: 389.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.93 : 678.85 = 281.96 : x
  2. Step 2: Convert to fraction form
    491.93/678.85 = 281.96/x
  3. Step 3: Cross multiply
    491.93x = 678.85 × 281.96
  4. Step 4: Simplify right side
    491.93x = 191,408.19
  5. Step 5: Solve for x
    x = 191,408.19/491.93
  6. Step 6: Final answer
    x = 389.09

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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.