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Finding the Fourth Proportional to 628.41, 939.15 and 579.15

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Solution

The fourth proportional to 628.41, 939.15 and 579.15 is: 865.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.41 : 939.15 = 579.15 : x
  2. Step 2: Convert to fraction form
    628.41/939.15 = 579.15/x
  3. Step 3: Cross multiply
    628.41x = 939.15 × 579.15
  4. Step 4: Simplify right side
    628.41x = 543,908.72
  5. Step 5: Solve for x
    x = 543,908.72/628.41
  6. Step 6: Final answer
    x = 865.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.