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Finding the Fourth Proportional to 654.92, 981.34 and 423.40

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Solution

The fourth proportional to 654.92, 981.34 and 423.40 is: 634.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.92 : 981.34 = 423.40 : x
  2. Step 2: Convert to fraction form
    654.92/981.34 = 423.40/x
  3. Step 3: Cross multiply
    654.92x = 981.34 × 423.40
  4. Step 4: Simplify right side
    654.92x = 415,499.36
  5. Step 5: Solve for x
    x = 415,499.36/654.92
  6. Step 6: Final answer
    x = 634.43

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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.