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Finding the Fourth Proportional to 805.65, 1,208.50 and 669.65

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Solution

The fourth proportional to 805.65, 1,208.50 and 669.65 is: 1,004.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.65 : 1,208.50 = 669.65 : x
  2. Step 2: Convert to fraction form
    805.65/1,208.50 = 669.65/x
  3. Step 3: Cross multiply
    805.65x = 1,208.50 × 669.65
  4. Step 4: Simplify right side
    805.65x = 809,271.35
  5. Step 5: Solve for x
    x = 809,271.35/805.65
  6. Step 6: Final answer
    x = 1,004.49

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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.