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Finding the Fourth Proportional to 293.85, 405.38 and 210.78

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Solution

The fourth proportional to 293.85, 405.38 and 210.78 is: 290.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.85 : 405.38 = 210.78 : x
  2. Step 2: Convert to fraction form
    293.85/405.38 = 210.78/x
  3. Step 3: Cross multiply
    293.85x = 405.38 × 210.78
  4. Step 4: Simplify right side
    293.85x = 85,444.94
  5. Step 5: Solve for x
    x = 85,444.94/293.85
  6. Step 6: Final answer
    x = 290.78

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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.