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Finding the Fourth Proportional to 786.97, 1,180.54 and 439.55

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Solution

The fourth proportional to 786.97, 1,180.54 and 439.55 is: 659.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.97 : 1,180.54 = 439.55 : x
  2. Step 2: Convert to fraction form
    786.97/1,180.54 = 439.55/x
  3. Step 3: Cross multiply
    786.97x = 1,180.54 × 439.55
  4. Step 4: Simplify right side
    786.97x = 518,908.75
  5. Step 5: Solve for x
    x = 518,908.75/786.97
  6. Step 6: Final answer
    x = 659.38

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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.