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Finding the Fourth Proportional to 519.66, 780.93 and 276.48

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Solution

The fourth proportional to 519.66, 780.93 and 276.48 is: 415.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.66 : 780.93 = 276.48 : x
  2. Step 2: Convert to fraction form
    519.66/780.93 = 276.48/x
  3. Step 3: Cross multiply
    519.66x = 780.93 × 276.48
  4. Step 4: Simplify right side
    519.66x = 215,911.53
  5. Step 5: Solve for x
    x = 215,911.53/519.66
  6. Step 6: Final answer
    x = 415.49

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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.