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Finding the Fourth Proportional to 786.02, 1,179.03 and 258.92

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Solution

The fourth proportional to 786.02, 1,179.03 and 258.92 is: 388.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.02 : 1,179.03 = 258.92 : x
  2. Step 2: Convert to fraction form
    786.02/1,179.03 = 258.92/x
  3. Step 3: Cross multiply
    786.02x = 1,179.03 × 258.92
  4. Step 4: Simplify right side
    786.02x = 305,268.55
  5. Step 5: Solve for x
    x = 305,268.55/786.02
  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.