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Finding the Fourth Proportional to 649.08, 971.66 and 418.20

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Solution

The fourth proportional to 649.08, 971.66 and 418.20 is: 626.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.08 : 971.66 = 418.20 : x
  2. Step 2: Convert to fraction form
    649.08/971.66 = 418.20/x
  3. Step 3: Cross multiply
    649.08x = 971.66 × 418.20
  4. Step 4: Simplify right side
    649.08x = 406,348.21
  5. Step 5: Solve for x
    x = 406,348.21/649.08
  6. Step 6: Final answer
    x = 626.04

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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.