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Finding the Fourth Proportional to 321.85, 482.78 and 245.77

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Solution

The fourth proportional to 321.85, 482.78 and 245.77 is: 368.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.85 : 482.78 = 245.77 : x
  2. Step 2: Convert to fraction form
    321.85/482.78 = 245.77/x
  3. Step 3: Cross multiply
    321.85x = 482.78 × 245.77
  4. Step 4: Simplify right side
    321.85x = 118,652.84
  5. Step 5: Solve for x
    x = 118,652.84/321.85
  6. Step 6: Final answer
    x = 368.66

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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.