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Finding the Fourth Proportional to 649.38, 974.41 and 389.90

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Solution

The fourth proportional to 649.38, 974.41 and 389.90 is: 585.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.38 : 974.41 = 389.90 : x
  2. Step 2: Convert to fraction form
    649.38/974.41 = 389.90/x
  3. Step 3: Cross multiply
    649.38x = 974.41 × 389.90
  4. Step 4: Simplify right side
    649.38x = 379,920.51
  5. Step 5: Solve for x
    x = 379,920.51/649.38
  6. Step 6: Final answer
    x = 585.06

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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.