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Finding the Fourth Proportional to 786.23, 1,179 and 258.99

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Solution

The fourth proportional to 786.23, 1,179 and 258.99 is: 388.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.23 : 1,179 = 258.99 : x
  2. Step 2: Convert to fraction form
    786.23/1,179 = 258.99/x
  3. Step 3: Cross multiply
    786.23x = 1,179 × 258.99
  4. Step 4: Simplify right side
    786.23x = 305,349.21
  5. Step 5: Solve for x
    x = 305,349.21/786.23
  6. Step 6: Final answer
    x = 388.37

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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.