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Finding the Fourth Proportional to 786.41, 1,179.80 and 266.39

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Solution

The fourth proportional to 786.41, 1,179.80 and 266.39 is: 399.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.41 : 1,179.80 = 266.39 : x
  2. Step 2: Convert to fraction form
    786.41/1,179.80 = 266.39/x
  3. Step 3: Cross multiply
    786.41x = 1,179.80 × 266.39
  4. Step 4: Simplify right side
    786.41x = 314,279.69
  5. Step 5: Solve for x
    x = 314,279.69/786.41
  6. Step 6: Final answer
    x = 399.64

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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.