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Finding the Fourth Proportional to 654.68, 981.79 and 490.05

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Solution

The fourth proportional to 654.68, 981.79 and 490.05 is: 734.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.68 : 981.79 = 490.05 : x
  2. Step 2: Convert to fraction form
    654.68/981.79 = 490.05/x
  3. Step 3: Cross multiply
    654.68x = 981.79 × 490.05
  4. Step 4: Simplify right side
    654.68x = 481,124.96
  5. Step 5: Solve for x
    x = 481,124.96/654.68
  6. Step 6: Final answer
    x = 734.90

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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.