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Finding the Fourth Proportional to 674.69, 1,011.87 and 345.41

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Solution

The fourth proportional to 674.69, 1,011.87 and 345.41 is: 518.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.69 : 1,011.87 = 345.41 : x
  2. Step 2: Convert to fraction form
    674.69/1,011.87 = 345.41/x
  3. Step 3: Cross multiply
    674.69x = 1,011.87 × 345.41
  4. Step 4: Simplify right side
    674.69x = 349,510.02
  5. Step 5: Solve for x
    x = 349,510.02/674.69
  6. Step 6: Final answer
    x = 518.03

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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.