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Finding the Fourth Proportional to 440.89, 661.02 and 206.54

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Solution

The fourth proportional to 440.89, 661.02 and 206.54 is: 309.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.89 : 661.02 = 206.54 : x
  2. Step 2: Convert to fraction form
    440.89/661.02 = 206.54/x
  3. Step 3: Cross multiply
    440.89x = 661.02 × 206.54
  4. Step 4: Simplify right side
    440.89x = 136,528.72
  5. Step 5: Solve for x
    x = 136,528.72/440.89
  6. Step 6: Final answer
    x = 309.67

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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.