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Finding the Fourth Proportional to 390.76, 539.24 and 235.56

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Solution

The fourth proportional to 390.76, 539.24 and 235.56 is: 325.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.76 : 539.24 = 235.56 : x
  2. Step 2: Convert to fraction form
    390.76/539.24 = 235.56/x
  3. Step 3: Cross multiply
    390.76x = 539.24 × 235.56
  4. Step 4: Simplify right side
    390.76x = 127,023.37
  5. Step 5: Solve for x
    x = 127,023.37/390.76
  6. Step 6: Final answer
    x = 325.07

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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.