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Finding the Fourth Proportional to 385.92, 532.44 and 245.78

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Solution

The fourth proportional to 385.92, 532.44 and 245.78 is: 339.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.92 : 532.44 = 245.78 : x
  2. Step 2: Convert to fraction form
    385.92/532.44 = 245.78/x
  3. Step 3: Cross multiply
    385.92x = 532.44 × 245.78
  4. Step 4: Simplify right side
    385.92x = 130,863.10
  5. Step 5: Solve for x
    x = 130,863.10/385.92
  6. Step 6: Final answer
    x = 339.09

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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.