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Finding the Fourth Proportional to 786.14, 1,178.19 and 323.40

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Solution

The fourth proportional to 786.14, 1,178.19 and 323.40 is: 484.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.14 : 1,178.19 = 323.40 : x
  2. Step 2: Convert to fraction form
    786.14/1,178.19 = 323.40/x
  3. Step 3: Cross multiply
    786.14x = 1,178.19 × 323.40
  4. Step 4: Simplify right side
    786.14x = 381,021.56
  5. Step 5: Solve for x
    x = 381,021.56/786.14
  6. Step 6: Final answer
    x = 484.67

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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.