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Finding the Fourth Proportional to 786.11, 1,178.25 and 439.22

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Solution

The fourth proportional to 786.11, 1,178.25 and 439.22 is: 658.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.11 : 1,178.25 = 439.22 : x
  2. Step 2: Convert to fraction form
    786.11/1,178.25 = 439.22/x
  3. Step 3: Cross multiply
    786.11x = 1,178.25 × 439.22
  4. Step 4: Simplify right side
    786.11x = 517,512.26
  5. Step 5: Solve for x
    x = 517,512.26/786.11
  6. Step 6: Final answer
    x = 658.32

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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.