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Finding the Fourth Proportional to 305.40, 458.21 and 122.86

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Solution

The fourth proportional to 305.40, 458.21 and 122.86 is: 184.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.40 : 458.21 = 122.86 : x
  2. Step 2: Convert to fraction form
    305.40/458.21 = 122.86/x
  3. Step 3: Cross multiply
    305.40x = 458.21 × 122.86
  4. Step 4: Simplify right side
    305.40x = 56,295.68
  5. Step 5: Solve for x
    x = 56,295.68/305.40
  6. Step 6: Final answer
    x = 184.33

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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.