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Finding the Fourth Proportional to 390.31, 538.46 and 250.38

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Solution

The fourth proportional to 390.31, 538.46 and 250.38 is: 345.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.31 : 538.46 = 250.38 : x
  2. Step 2: Convert to fraction form
    390.31/538.46 = 250.38/x
  3. Step 3: Cross multiply
    390.31x = 538.46 × 250.38
  4. Step 4: Simplify right side
    390.31x = 134,817.02
  5. Step 5: Solve for x
    x = 134,817.02/390.31
  6. Step 6: Final answer
    x = 345.41

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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.