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Finding the Fourth Proportional to 383.21, 528.65 and 235.79

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Solution

The fourth proportional to 383.21, 528.65 and 235.79 is: 325.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.21 : 528.65 = 235.79 : x
  2. Step 2: Convert to fraction form
    383.21/528.65 = 235.79/x
  3. Step 3: Cross multiply
    383.21x = 528.65 × 235.79
  4. Step 4: Simplify right side
    383.21x = 124,650.38
  5. Step 5: Solve for x
    x = 124,650.38/383.21
  6. Step 6: Final answer
    x = 325.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.