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Finding the Fourth Proportional to 655.35, 981.41 and 380.61

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Solution

The fourth proportional to 655.35, 981.41 and 380.61 is: 569.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.35 : 981.41 = 380.61 : x
  2. Step 2: Convert to fraction form
    655.35/981.41 = 380.61/x
  3. Step 3: Cross multiply
    655.35x = 981.41 × 380.61
  4. Step 4: Simplify right side
    655.35x = 373,532.56
  5. Step 5: Solve for x
    x = 373,532.56/655.35
  6. Step 6: Final answer
    x = 569.97

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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.