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Finding the Fourth Proportional to 674.63, 930.84 and 391.03

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Solution

The fourth proportional to 674.63, 930.84 and 391.03 is: 539.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.63 : 930.84 = 391.03 : x
  2. Step 2: Convert to fraction form
    674.63/930.84 = 391.03/x
  3. Step 3: Cross multiply
    674.63x = 930.84 × 391.03
  4. Step 4: Simplify right side
    674.63x = 363,984.77
  5. Step 5: Solve for x
    x = 363,984.77/674.63
  6. Step 6: Final answer
    x = 539.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.