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Finding the Fourth Proportional to 421.56, 629.19 and 359.46

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Solution

The fourth proportional to 421.56, 629.19 and 359.46 is: 536.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.56 : 629.19 = 359.46 : x
  2. Step 2: Convert to fraction form
    421.56/629.19 = 359.46/x
  3. Step 3: Cross multiply
    421.56x = 629.19 × 359.46
  4. Step 4: Simplify right side
    421.56x = 226,168.64
  5. Step 5: Solve for x
    x = 226,168.64/421.56
  6. Step 6: Final answer
    x = 536.50

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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.