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Finding the Fourth Proportional to 485.34, 669.32 and 361.31

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Solution

The fourth proportional to 485.34, 669.32 and 361.31 is: 498.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.34 : 669.32 = 361.31 : x
  2. Step 2: Convert to fraction form
    485.34/669.32 = 361.31/x
  3. Step 3: Cross multiply
    485.34x = 669.32 × 361.31
  4. Step 4: Simplify right side
    485.34x = 241,828.66
  5. Step 5: Solve for x
    x = 241,828.66/485.34
  6. Step 6: Final answer
    x = 498.27

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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.