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Finding the Fourth Proportional to 390.18, 538.56 and 234.93

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Solution

The fourth proportional to 390.18, 538.56 and 234.93 is: 324.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.18 : 538.56 = 234.93 : x
  2. Step 2: Convert to fraction form
    390.18/538.56 = 234.93/x
  3. Step 3: Cross multiply
    390.18x = 538.56 × 234.93
  4. Step 4: Simplify right side
    390.18x = 126,523.90
  5. Step 5: Solve for x
    x = 126,523.90/390.18
  6. Step 6: Final answer
    x = 324.27

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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.