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Finding the Fourth Proportional to 257.69, 355.94 and 208.76

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Solution

The fourth proportional to 257.69, 355.94 and 208.76 is: 288.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.69 : 355.94 = 208.76 : x
  2. Step 2: Convert to fraction form
    257.69/355.94 = 208.76/x
  3. Step 3: Cross multiply
    257.69x = 355.94 × 208.76
  4. Step 4: Simplify right side
    257.69x = 74,303.21
  5. Step 5: Solve for x
    x = 74,303.21/257.69
  6. Step 6: Final answer
    x = 288.35

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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.