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Finding the Fourth Proportional to 257.64, 355.38 and 211.08

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Solution

The fourth proportional to 257.64, 355.38 and 211.08 is: 291.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.64 : 355.38 = 211.08 : x
  2. Step 2: Convert to fraction form
    257.64/355.38 = 211.08/x
  3. Step 3: Cross multiply
    257.64x = 355.38 × 211.08
  4. Step 4: Simplify right side
    257.64x = 75,013.61
  5. Step 5: Solve for x
    x = 75,013.61/257.64
  6. Step 6: Final answer
    x = 291.16

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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.