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Finding the Fourth Proportional to 669.77, 1,005.11 and 323.19

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Solution

The fourth proportional to 669.77, 1,005.11 and 323.19 is: 485.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.77 : 1,005.11 = 323.19 : x
  2. Step 2: Convert to fraction form
    669.77/1,005.11 = 323.19/x
  3. Step 3: Cross multiply
    669.77x = 1,005.11 × 323.19
  4. Step 4: Simplify right side
    669.77x = 324,841.10
  5. Step 5: Solve for x
    x = 324,841.10/669.77
  6. Step 6: Final answer
    x = 485.00

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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.