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Finding the Fourth Proportional to 400.40, 600.65 and 140.43

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Solution

The fourth proportional to 400.40, 600.65 and 140.43 is: 210.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.40 : 600.65 = 140.43 : x
  2. Step 2: Convert to fraction form
    400.40/600.65 = 140.43/x
  3. Step 3: Cross multiply
    400.40x = 600.65 × 140.43
  4. Step 4: Simplify right side
    400.40x = 84,347.38
  5. Step 5: Solve for x
    x = 84,347.38/400.40
  6. Step 6: Final answer
    x = 210.66

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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.