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Finding the Fourth Proportional to 355.19, 490.19 and 215.31

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Solution

The fourth proportional to 355.19, 490.19 and 215.31 is: 297.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.19 : 490.19 = 215.31 : x
  2. Step 2: Convert to fraction form
    355.19/490.19 = 215.31/x
  3. Step 3: Cross multiply
    355.19x = 490.19 × 215.31
  4. Step 4: Simplify right side
    355.19x = 105,541.73
  5. Step 5: Solve for x
    x = 105,541.73/355.19
  6. Step 6: Final answer
    x = 297.15

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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.