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Finding the Fourth Proportional to 786.15, 1,179.80 and 396.05

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Solution

The fourth proportional to 786.15, 1,179.80 and 396.05 is: 594.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.15 : 1,179.80 = 396.05 : x
  2. Step 2: Convert to fraction form
    786.15/1,179.80 = 396.05/x
  3. Step 3: Cross multiply
    786.15x = 1,179.80 × 396.05
  4. Step 4: Simplify right side
    786.15x = 467,253.40
  5. Step 5: Solve for x
    x = 467,253.40/786.15
  6. Step 6: Final answer
    x = 594.36

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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.