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Finding the Fourth Proportional to 438.68, 657.42 and 243.71

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Solution

The fourth proportional to 438.68, 657.42 and 243.71 is: 365.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.68 : 657.42 = 243.71 : x
  2. Step 2: Convert to fraction form
    438.68/657.42 = 243.71/x
  3. Step 3: Cross multiply
    438.68x = 657.42 × 243.71
  4. Step 4: Simplify right side
    438.68x = 160,218.09
  5. Step 5: Solve for x
    x = 160,218.09/438.68
  6. Step 6: Final answer
    x = 365.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.