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Finding the Fourth Proportional to 689.55, 1,033.95 and 342.12

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Solution

The fourth proportional to 689.55, 1,033.95 and 342.12 is: 512.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.55 : 1,033.95 = 342.12 : x
  2. Step 2: Convert to fraction form
    689.55/1,033.95 = 342.12/x
  3. Step 3: Cross multiply
    689.55x = 1,033.95 × 342.12
  4. Step 4: Simplify right side
    689.55x = 353,734.97
  5. Step 5: Solve for x
    x = 353,734.97/689.55
  6. Step 6: Final answer
    x = 512.99

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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.