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Finding the Fourth Proportional to 390.20, 538.68 and 250.52

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Solution

The fourth proportional to 390.20, 538.68 and 250.52 is: 345.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.20 : 538.68 = 250.52 : x
  2. Step 2: Convert to fraction form
    390.20/538.68 = 250.52/x
  3. Step 3: Cross multiply
    390.20x = 538.68 × 250.52
  4. Step 4: Simplify right side
    390.20x = 134,950.11
  5. Step 5: Solve for x
    x = 134,950.11/390.20
  6. Step 6: Final answer
    x = 345.85

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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.