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Finding the Fourth Proportional to 628.10, 939.90 and 397.10

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Solution

The fourth proportional to 628.10, 939.90 and 397.10 is: 594.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.10 : 939.90 = 397.10 : x
  2. Step 2: Convert to fraction form
    628.10/939.90 = 397.10/x
  3. Step 3: Cross multiply
    628.10x = 939.90 × 397.10
  4. Step 4: Simplify right side
    628.10x = 373,234.29
  5. Step 5: Solve for x
    x = 373,234.29/628.10
  6. Step 6: Final answer
    x = 594.23

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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.