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Finding the Fourth Proportional to 613.63, 920.45 and 180.78

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Solution

The fourth proportional to 613.63, 920.45 and 180.78 is: 271.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.63 : 920.45 = 180.78 : x
  2. Step 2: Convert to fraction form
    613.63/920.45 = 180.78/x
  3. Step 3: Cross multiply
    613.63x = 920.45 × 180.78
  4. Step 4: Simplify right side
    613.63x = 166,400.11
  5. Step 5: Solve for x
    x = 166,400.11/613.63
  6. Step 6: Final answer
    x = 271.18

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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.