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Finding the Fourth Proportional to 786.24, 1,179.36 and 439.90

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Solution

The fourth proportional to 786.24, 1,179.36 and 439.90 is: 659.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.24 : 1,179.36 = 439.90 : x
  2. Step 2: Convert to fraction form
    786.24/1,179.36 = 439.90/x
  3. Step 3: Cross multiply
    786.24x = 1,179.36 × 439.90
  4. Step 4: Simplify right side
    786.24x = 518,797.52
  5. Step 5: Solve for x
    x = 518,797.52/786.24
  6. Step 6: Final answer
    x = 659.85

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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.