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Finding the Fourth Proportional to 655.16, 981.75 and 394.87

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Solution

The fourth proportional to 655.16, 981.75 and 394.87 is: 591.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.16 : 981.75 = 394.87 : x
  2. Step 2: Convert to fraction form
    655.16/981.75 = 394.87/x
  3. Step 3: Cross multiply
    655.16x = 981.75 × 394.87
  4. Step 4: Simplify right side
    655.16x = 387,661.65
  5. Step 5: Solve for x
    x = 387,661.65/655.16
  6. Step 6: Final answer
    x = 591.71

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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.