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Finding the Fourth Proportional to 243.47, 335.99 and 145.23

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Solution

The fourth proportional to 243.47, 335.99 and 145.23 is: 200.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.47 : 335.99 = 145.23 : x
  2. Step 2: Convert to fraction form
    243.47/335.99 = 145.23/x
  3. Step 3: Cross multiply
    243.47x = 335.99 × 145.23
  4. Step 4: Simplify right side
    243.47x = 48,796.71
  5. Step 5: Solve for x
    x = 48,796.71/243.47
  6. Step 6: Final answer
    x = 200.42

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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.