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Finding the Fourth Proportional to 284.36, 391.38 and 275.40

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Solution

The fourth proportional to 284.36, 391.38 and 275.40 is: 379.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.36 : 391.38 = 275.40 : x
  2. Step 2: Convert to fraction form
    284.36/391.38 = 275.40/x
  3. Step 3: Cross multiply
    284.36x = 391.38 × 275.40
  4. Step 4: Simplify right side
    284.36x = 107,786.05
  5. Step 5: Solve for x
    x = 107,786.05/284.36
  6. Step 6: Final answer
    x = 379.05

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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.