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Finding the Fourth Proportional to 390.43, 538.82 and 250.48

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Solution

The fourth proportional to 390.43, 538.82 and 250.48 is: 345.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.43 : 538.82 = 250.48 : x
  2. Step 2: Convert to fraction form
    390.43/538.82 = 250.48/x
  3. Step 3: Cross multiply
    390.43x = 538.82 × 250.48
  4. Step 4: Simplify right side
    390.43x = 134,963.63
  5. Step 5: Solve for x
    x = 134,963.63/390.43
  6. Step 6: Final answer
    x = 345.68

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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.