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Finding the Fourth Proportional to 655.28, 981.46 and 380.69

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Solution

The fourth proportional to 655.28, 981.46 and 380.69 is: 570.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.28 : 981.46 = 380.69 : x
  2. Step 2: Convert to fraction form
    655.28/981.46 = 380.69/x
  3. Step 3: Cross multiply
    655.28x = 981.46 × 380.69
  4. Step 4: Simplify right side
    655.28x = 373,626.15
  5. Step 5: Solve for x
    x = 373,626.15/655.28
  6. Step 6: Final answer
    x = 570.18

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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.