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Finding the Fourth Proportional to 805.23, 1,208.96 and 415.55

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Solution

The fourth proportional to 805.23, 1,208.96 and 415.55 is: 623.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.23 : 1,208.96 = 415.55 : x
  2. Step 2: Convert to fraction form
    805.23/1,208.96 = 415.55/x
  3. Step 3: Cross multiply
    805.23x = 1,208.96 × 415.55
  4. Step 4: Simplify right side
    805.23x = 502,385.83
  5. Step 5: Solve for x
    x = 502,385.83/805.23
  6. Step 6: Final answer
    x = 623.90

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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.