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Finding the Fourth Proportional to 805.38, 1,207.35 and 415.17

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Solution

The fourth proportional to 805.38, 1,207.35 and 415.17 is: 622.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.38 : 1,207.35 = 415.17 : x
  2. Step 2: Convert to fraction form
    805.38/1,207.35 = 415.17/x
  3. Step 3: Cross multiply
    805.38x = 1,207.35 × 415.17
  4. Step 4: Simplify right side
    805.38x = 501,255.50
  5. Step 5: Solve for x
    x = 501,255.50/805.38
  6. Step 6: Final answer
    x = 622.38

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1.5x scale

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.