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Finding the Fourth Proportional to 257.76, 355.88 and 208.86

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Solution

The fourth proportional to 257.76, 355.88 and 208.86 is: 288.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.76 : 355.88 = 208.86 : x
  2. Step 2: Convert to fraction form
    257.76/355.88 = 208.86/x
  3. Step 3: Cross multiply
    257.76x = 355.88 × 208.86
  4. Step 4: Simplify right side
    257.76x = 74,329.10
  5. Step 5: Solve for x
    x = 74,329.10/257.76
  6. Step 6: Final answer
    x = 288.37

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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.