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Finding the Fourth Proportional to 279.28, 385.26 and 190.74

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Solution

The fourth proportional to 279.28, 385.26 and 190.74 is: 263.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.28 : 385.26 = 190.74 : x
  2. Step 2: Convert to fraction form
    279.28/385.26 = 190.74/x
  3. Step 3: Cross multiply
    279.28x = 385.26 × 190.74
  4. Step 4: Simplify right side
    279.28x = 73,484.49
  5. Step 5: Solve for x
    x = 73,484.49/279.28
  6. Step 6: Final answer
    x = 263.12

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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.