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Finding the Fourth Proportional to 408.40, 563.55 and 242.65

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Solution

The fourth proportional to 408.40, 563.55 and 242.65 is: 334.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.40 : 563.55 = 242.65 : x
  2. Step 2: Convert to fraction form
    408.40/563.55 = 242.65/x
  3. Step 3: Cross multiply
    408.40x = 563.55 × 242.65
  4. Step 4: Simplify right side
    408.40x = 136,745.41
  5. Step 5: Solve for x
    x = 136,745.41/408.40
  6. Step 6: Final answer
    x = 334.83

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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.