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Finding the Fourth Proportional to 259.87, 358.28 and 217.31

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Solution

The fourth proportional to 259.87, 358.28 and 217.31 is: 299.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.87 : 358.28 = 217.31 : x
  2. Step 2: Convert to fraction form
    259.87/358.28 = 217.31/x
  3. Step 3: Cross multiply
    259.87x = 358.28 × 217.31
  4. Step 4: Simplify right side
    259.87x = 77,856.58
  5. Step 5: Solve for x
    x = 77,856.58/259.87
  6. Step 6: Final answer
    x = 299.60

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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.