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Finding the Fourth Proportional to 390.58, 538.96 and 243.23

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Solution

The fourth proportional to 390.58, 538.96 and 243.23 is: 335.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.58 : 538.96 = 243.23 : x
  2. Step 2: Convert to fraction form
    390.58/538.96 = 243.23/x
  3. Step 3: Cross multiply
    390.58x = 538.96 × 243.23
  4. Step 4: Simplify right side
    390.58x = 131,091.24
  5. Step 5: Solve for x
    x = 131,091.24/390.58
  6. Step 6: Final answer
    x = 335.63

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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.