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Finding the Fourth Proportional to 260.32, 390 and 212.08

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Solution

The fourth proportional to 260.32, 390 and 212.08 is: 317.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.32 : 390 = 212.08 : x
  2. Step 2: Convert to fraction form
    260.32/390 = 212.08/x
  3. Step 3: Cross multiply
    260.32x = 390 × 212.08
  4. Step 4: Simplify right side
    260.32x = 82,711.20
  5. Step 5: Solve for x
    x = 82,711.20/260.32
  6. Step 6: Final answer
    x = 317.73

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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.