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Finding the Fourth Proportional to 689.51, 1,033.36 and 323.95

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Solution

The fourth proportional to 689.51, 1,033.36 and 323.95 is: 485.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.51 : 1,033.36 = 323.95 : x
  2. Step 2: Convert to fraction form
    689.51/1,033.36 = 323.95/x
  3. Step 3: Cross multiply
    689.51x = 1,033.36 × 323.95
  4. Step 4: Simplify right side
    689.51x = 334,755.52
  5. Step 5: Solve for x
    x = 334,755.52/689.51
  6. Step 6: Final answer
    x = 485.50

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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.