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Finding the Fourth Proportional to 440.56, 661.11 and 258.31

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Solution

The fourth proportional to 440.56, 661.11 and 258.31 is: 387.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.56 : 661.11 = 258.31 : x
  2. Step 2: Convert to fraction form
    440.56/661.11 = 258.31/x
  3. Step 3: Cross multiply
    440.56x = 661.11 × 258.31
  4. Step 4: Simplify right side
    440.56x = 170,771.32
  5. Step 5: Solve for x
    x = 170,771.32/440.56
  6. Step 6: Final answer
    x = 387.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.