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Finding the Fourth Proportional to 805.82, 1,209.75 and 670.52

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Solution

The fourth proportional to 805.82, 1,209.75 and 670.52 is: 1,006.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.82 : 1,209.75 = 670.52 : x
  2. Step 2: Convert to fraction form
    805.82/1,209.75 = 670.52/x
  3. Step 3: Cross multiply
    805.82x = 1,209.75 × 670.52
  4. Step 4: Simplify right side
    805.82x = 811,161.57
  5. Step 5: Solve for x
    x = 811,161.57/805.82
  6. Step 6: Final answer
    x = 1,006.63

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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.