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Finding the Fourth Proportional to 421.79, 582.05 and 235.28

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Solution

The fourth proportional to 421.79, 582.05 and 235.28 is: 324.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.79 : 582.05 = 235.28 : x
  2. Step 2: Convert to fraction form
    421.79/582.05 = 235.28/x
  3. Step 3: Cross multiply
    421.79x = 582.05 × 235.28
  4. Step 4: Simplify right side
    421.79x = 136,942.40
  5. Step 5: Solve for x
    x = 136,942.40/421.79
  6. Step 6: Final answer
    x = 324.67

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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.