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Finding the Fourth Proportional to 613.72, 920.40 and 505.24

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Solution

The fourth proportional to 613.72, 920.40 and 505.24 is: 757.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.72 : 920.40 = 505.24 : x
  2. Step 2: Convert to fraction form
    613.72/920.40 = 505.24/x
  3. Step 3: Cross multiply
    613.72x = 920.40 × 505.24
  4. Step 4: Simplify right side
    613.72x = 465,022.90
  5. Step 5: Solve for x
    x = 465,022.90/613.72
  6. Step 6: Final answer
    x = 757.71

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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.