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Finding the Fourth Proportional to 439.77, 659.81 and 266.55

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Solution

The fourth proportional to 439.77, 659.81 and 266.55 is: 399.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.77 : 659.81 = 266.55 : x
  2. Step 2: Convert to fraction form
    439.77/659.81 = 266.55/x
  3. Step 3: Cross multiply
    439.77x = 659.81 × 266.55
  4. Step 4: Simplify right side
    439.77x = 175,872.36
  5. Step 5: Solve for x
    x = 175,872.36/439.77
  6. Step 6: Final answer
    x = 399.92

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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.