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Finding the Fourth Proportional to 813.41, 1,220.85 and 505.86

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Solution

The fourth proportional to 813.41, 1,220.85 and 505.86 is: 759.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.41 : 1,220.85 = 505.86 : x
  2. Step 2: Convert to fraction form
    813.41/1,220.85 = 505.86/x
  3. Step 3: Cross multiply
    813.41x = 1,220.85 × 505.86
  4. Step 4: Simplify right side
    813.41x = 617,579.18
  5. Step 5: Solve for x
    x = 617,579.18/813.41
  6. Step 6: Final answer
    x = 759.25

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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.