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Finding the Fourth Proportional to 440.63, 604.70 and 399.09

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Solution

The fourth proportional to 440.63, 604.70 and 399.09 is: 547.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.63 : 604.70 = 399.09 : x
  2. Step 2: Convert to fraction form
    440.63/604.70 = 399.09/x
  3. Step 3: Cross multiply
    440.63x = 604.70 × 399.09
  4. Step 4: Simplify right side
    440.63x = 241,330.72
  5. Step 5: Solve for x
    x = 241,330.72/440.63
  6. Step 6: Final answer
    x = 547.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.