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Finding the Fourth Proportional to 670.99, 1,008.38 and 397.21

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Solution

The fourth proportional to 670.99, 1,008.38 and 397.21 is: 596.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.99 : 1,008.38 = 397.21 : x
  2. Step 2: Convert to fraction form
    670.99/1,008.38 = 397.21/x
  3. Step 3: Cross multiply
    670.99x = 1,008.38 × 397.21
  4. Step 4: Simplify right side
    670.99x = 400,538.62
  5. Step 5: Solve for x
    x = 400,538.62/670.99
  6. Step 6: Final answer
    x = 596.94

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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.