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Finding the Fourth Proportional to 421.39, 629.30 and 360.03

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Solution

The fourth proportional to 421.39, 629.30 and 360.03 is: 537.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.39 : 629.30 = 360.03 : x
  2. Step 2: Convert to fraction form
    421.39/629.30 = 360.03/x
  3. Step 3: Cross multiply
    421.39x = 629.30 × 360.03
  4. Step 4: Simplify right side
    421.39x = 226,566.88
  5. Step 5: Solve for x
    x = 226,566.88/421.39
  6. Step 6: Final answer
    x = 537.67

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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.