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Finding the Fourth Proportional to 426.96, 636.94 and 390.64

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Solution

The fourth proportional to 426.96, 636.94 and 390.64 is: 582.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.96 : 636.94 = 390.64 : x
  2. Step 2: Convert to fraction form
    426.96/636.94 = 390.64/x
  3. Step 3: Cross multiply
    426.96x = 636.94 × 390.64
  4. Step 4: Simplify right side
    426.96x = 248,814.24
  5. Step 5: Solve for x
    x = 248,814.24/426.96
  6. Step 6: Final answer
    x = 582.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.