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Finding the Fourth Proportional to 243.30, 335.79 and 156.23

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Solution

The fourth proportional to 243.30, 335.79 and 156.23 is: 215.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.30 : 335.79 = 156.23 : x
  2. Step 2: Convert to fraction form
    243.30/335.79 = 156.23/x
  3. Step 3: Cross multiply
    243.30x = 335.79 × 156.23
  4. Step 4: Simplify right side
    243.30x = 52,460.47
  5. Step 5: Solve for x
    x = 52,460.47/243.30
  6. Step 6: Final answer
    x = 215.62

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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.