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Finding the Fourth Proportional to 319.55, 479.93 and 266.09

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Solution

The fourth proportional to 319.55, 479.93 and 266.09 is: 399.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.55 : 479.93 = 266.09 : x
  2. Step 2: Convert to fraction form
    319.55/479.93 = 266.09/x
  3. Step 3: Cross multiply
    319.55x = 479.93 × 266.09
  4. Step 4: Simplify right side
    319.55x = 127,700.84
  5. Step 5: Solve for x
    x = 127,700.84/319.55
  6. Step 6: Final answer
    x = 399.63

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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.