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Finding the Fourth Proportional to 390.37, 538.54 and 250.44

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Solution

The fourth proportional to 390.37, 538.54 and 250.44 is: 345.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.37 : 538.54 = 250.44 : x
  2. Step 2: Convert to fraction form
    390.37/538.54 = 250.44/x
  3. Step 3: Cross multiply
    390.37x = 538.54 × 250.44
  4. Step 4: Simplify right side
    390.37x = 134,871.96
  5. Step 5: Solve for x
    x = 134,871.96/390.37
  6. Step 6: Final answer
    x = 345.50

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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.