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Finding the Fourth Proportional to 319.76, 479.40 and 266

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Solution

The fourth proportional to 319.76, 479.40 and 266 is: 398.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.76 : 479.40 = 266 : x
  2. Step 2: Convert to fraction form
    319.76/479.40 = 266/x
  3. Step 3: Cross multiply
    319.76x = 479.40 × 266
  4. Step 4: Simplify right side
    319.76x = 127,520.40
  5. Step 5: Solve for x
    x = 127,520.40/319.76
  6. Step 6: Final answer
    x = 398.80

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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.