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Finding the Fourth Proportional to 385.43, 532.21 and 245.79

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Solution

The fourth proportional to 385.43, 532.21 and 245.79 is: 339.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.43 : 532.21 = 245.79 : x
  2. Step 2: Convert to fraction form
    385.43/532.21 = 245.79/x
  3. Step 3: Cross multiply
    385.43x = 532.21 × 245.79
  4. Step 4: Simplify right side
    385.43x = 130,811.28
  5. Step 5: Solve for x
    x = 130,811.28/385.43
  6. Step 6: Final answer
    x = 339.39

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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.