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Finding the Fourth Proportional to 684.64, 1,027.20 and 251.68

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Solution

The fourth proportional to 684.64, 1,027.20 and 251.68 is: 377.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.64 : 1,027.20 = 251.68 : x
  2. Step 2: Convert to fraction form
    684.64/1,027.20 = 251.68/x
  3. Step 3: Cross multiply
    684.64x = 1,027.20 × 251.68
  4. Step 4: Simplify right side
    684.64x = 258,525.70
  5. Step 5: Solve for x
    x = 258,525.70/684.64
  6. Step 6: Final answer
    x = 377.61

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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.