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Finding the Fourth Proportional to 284.36, 391.20 and 251

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Solution

The fourth proportional to 284.36, 391.20 and 251 is: 345.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.36 : 391.20 = 251 : x
  2. Step 2: Convert to fraction form
    284.36/391.20 = 251/x
  3. Step 3: Cross multiply
    284.36x = 391.20 × 251
  4. Step 4: Simplify right side
    284.36x = 98,191.20
  5. Step 5: Solve for x
    x = 98,191.20/284.36
  6. Step 6: Final answer
    x = 345.31

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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.