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Finding the Fourth Proportional to 353.75, 488.18 and 215.75

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Solution

The fourth proportional to 353.75, 488.18 and 215.75 is: 297.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.75 : 488.18 = 215.75 : x
  2. Step 2: Convert to fraction form
    353.75/488.18 = 215.75/x
  3. Step 3: Cross multiply
    353.75x = 488.18 × 215.75
  4. Step 4: Simplify right side
    353.75x = 105,324.84
  5. Step 5: Solve for x
    x = 105,324.84/353.75
  6. Step 6: Final answer
    x = 297.74

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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.