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Finding the Fourth Proportional to 358.57, 494.49 and 285.13

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Solution

The fourth proportional to 358.57, 494.49 and 285.13 is: 393.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.57 : 494.49 = 285.13 : x
  2. Step 2: Convert to fraction form
    358.57/494.49 = 285.13/x
  3. Step 3: Cross multiply
    358.57x = 494.49 × 285.13
  4. Step 4: Simplify right side
    358.57x = 140,993.93
  5. Step 5: Solve for x
    x = 140,993.93/358.57
  6. Step 6: Final answer
    x = 393.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.