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Finding the Fourth Proportional to 355.64, 490.72 and 215.74

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Solution

The fourth proportional to 355.64, 490.72 and 215.74 is: 297.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.64 : 490.72 = 215.74 : x
  2. Step 2: Convert to fraction form
    355.64/490.72 = 215.74/x
  3. Step 3: Cross multiply
    355.64x = 490.72 × 215.74
  4. Step 4: Simplify right side
    355.64x = 105,867.93
  5. Step 5: Solve for x
    x = 105,867.93/355.64
  6. Step 6: Final answer
    x = 297.68

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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.