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Finding the Fourth Proportional to 955.87, 1,434.23 and 408.40

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Solution

The fourth proportional to 955.87, 1,434.23 and 408.40 is: 612.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.87 : 1,434.23 = 408.40 : x
  2. Step 2: Convert to fraction form
    955.87/1,434.23 = 408.40/x
  3. Step 3: Cross multiply
    955.87x = 1,434.23 × 408.40
  4. Step 4: Simplify right side
    955.87x = 585,739.53
  5. Step 5: Solve for x
    x = 585,739.53/955.87
  6. Step 6: Final answer
    x = 612.78

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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.