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Finding the Fourth Proportional to 613.91, 920.86 and 505.47

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Solution

The fourth proportional to 613.91, 920.86 and 505.47 is: 758.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.91 : 920.86 = 505.47 : x
  2. Step 2: Convert to fraction form
    613.91/920.86 = 505.47/x
  3. Step 3: Cross multiply
    613.91x = 920.86 × 505.47
  4. Step 4: Simplify right side
    613.91x = 465,468.37
  5. Step 5: Solve for x
    x = 465,468.37/613.91
  6. Step 6: Final answer
    x = 758.20

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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.