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Finding the Fourth Proportional to 689.16, 1,033.26 and 323.76

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Solution

The fourth proportional to 689.16, 1,033.26 and 323.76 is: 485.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.16 : 1,033.26 = 323.76 : x
  2. Step 2: Convert to fraction form
    689.16/1,033.26 = 323.76/x
  3. Step 3: Cross multiply
    689.16x = 1,033.26 × 323.76
  4. Step 4: Simplify right side
    689.16x = 334,528.26
  5. Step 5: Solve for x
    x = 334,528.26/689.16
  6. Step 6: Final answer
    x = 485.41

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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.