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Finding the Fourth Proportional to 805.64, 1,208.39 and 415.43

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Solution

The fourth proportional to 805.64, 1,208.39 and 415.43 is: 623.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.64 : 1,208.39 = 415.43 : x
  2. Step 2: Convert to fraction form
    805.64/1,208.39 = 415.43/x
  3. Step 3: Cross multiply
    805.64x = 1,208.39 × 415.43
  4. Step 4: Simplify right side
    805.64x = 501,993.34
  5. Step 5: Solve for x
    x = 501,993.34/805.64
  6. Step 6: Final answer
    x = 623.10

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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.