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Finding the Fourth Proportional to 813.63, 1,221.06 and 505.94

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Solution

The fourth proportional to 813.63, 1,221.06 and 505.94 is: 759.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.63 : 1,221.06 = 505.94 : x
  2. Step 2: Convert to fraction form
    813.63/1,221.06 = 505.94/x
  3. Step 3: Cross multiply
    813.63x = 1,221.06 × 505.94
  4. Step 4: Simplify right side
    813.63x = 617,774.46
  5. Step 5: Solve for x
    x = 617,774.46/813.63
  6. Step 6: Final answer
    x = 759.28

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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.