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Finding the Fourth Proportional to 780.35, 1,076.80 and 481.55

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Solution

The fourth proportional to 780.35, 1,076.80 and 481.55 is: 664.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.35 : 1,076.80 = 481.55 : x
  2. Step 2: Convert to fraction form
    780.35/1,076.80 = 481.55/x
  3. Step 3: Cross multiply
    780.35x = 1,076.80 × 481.55
  4. Step 4: Simplify right side
    780.35x = 518,526.45
  5. Step 5: Solve for x
    x = 518,526.45/780.35
  6. Step 6: Final answer
    x = 664.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.