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Finding the Fourth Proportional to 280, 385.86 and 248.68

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Solution

The fourth proportional to 280, 385.86 and 248.68 is: 342.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    280 : 385.86 = 248.68 : x
  2. Step 2: Convert to fraction form
    280/385.86 = 248.68/x
  3. Step 3: Cross multiply
    280x = 385.86 × 248.68
  4. Step 4: Simplify right side
    280x = 95,955.66
  5. Step 5: Solve for x
    x = 95,955.66/280
  6. Step 6: Final answer
    x = 342.70

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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.