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Finding the Fourth Proportional to 956.39, 1,434.65 and 408.57

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Solution

The fourth proportional to 956.39, 1,434.65 and 408.57 is: 612.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.39 : 1,434.65 = 408.57 : x
  2. Step 2: Convert to fraction form
    956.39/1,434.65 = 408.57/x
  3. Step 3: Cross multiply
    956.39x = 1,434.65 × 408.57
  4. Step 4: Simplify right side
    956.39x = 586,154.95
  5. Step 5: Solve for x
    x = 586,154.95/956.39
  6. Step 6: Final answer
    x = 612.88

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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.