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Finding the Fourth Proportional to 279.74, 385.70 and 255.08

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Solution

The fourth proportional to 279.74, 385.70 and 255.08 is: 351.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.74 : 385.70 = 255.08 : x
  2. Step 2: Convert to fraction form
    279.74/385.70 = 255.08/x
  3. Step 3: Cross multiply
    279.74x = 385.70 × 255.08
  4. Step 4: Simplify right side
    279.74x = 98,384.36
  5. Step 5: Solve for x
    x = 98,384.36/279.74
  6. Step 6: Final answer
    x = 351.70

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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.