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Finding the Fourth Proportional to 439.63, 659.51 and 266.43

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Solution

The fourth proportional to 439.63, 659.51 and 266.43 is: 399.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.63 : 659.51 = 266.43 : x
  2. Step 2: Convert to fraction form
    439.63/659.51 = 266.43/x
  3. Step 3: Cross multiply
    439.63x = 659.51 × 266.43
  4. Step 4: Simplify right side
    439.63x = 175,713.25
  5. Step 5: Solve for x
    x = 175,713.25/439.63
  6. Step 6: Final answer
    x = 399.68

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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.