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Finding the Fourth Proportional to 445.13, 613.78 and 287.75

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Solution

The fourth proportional to 445.13, 613.78 and 287.75 is: 396.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.13 : 613.78 = 287.75 : x
  2. Step 2: Convert to fraction form
    445.13/613.78 = 287.75/x
  3. Step 3: Cross multiply
    445.13x = 613.78 × 287.75
  4. Step 4: Simplify right side
    445.13x = 176,615.20
  5. Step 5: Solve for x
    x = 176,615.20/445.13
  6. Step 6: Final answer
    x = 396.77

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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.