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Finding the Fourth Proportional to 260.53, 390.21 and 217.09

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Solution

The fourth proportional to 260.53, 390.21 and 217.09 is: 325.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.53 : 390.21 = 217.09 : x
  2. Step 2: Convert to fraction form
    260.53/390.21 = 217.09/x
  3. Step 3: Cross multiply
    260.53x = 390.21 × 217.09
  4. Step 4: Simplify right side
    260.53x = 84,710.69
  5. Step 5: Solve for x
    x = 84,710.69/260.53
  6. Step 6: Final answer
    x = 325.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.