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Finding the Fourth Proportional to 438.31, 657.38 and 191.38

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Solution

The fourth proportional to 438.31, 657.38 and 191.38 is: 287.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.31 : 657.38 = 191.38 : x
  2. Step 2: Convert to fraction form
    438.31/657.38 = 191.38/x
  3. Step 3: Cross multiply
    438.31x = 657.38 × 191.38
  4. Step 4: Simplify right side
    438.31x = 125,808.22
  5. Step 5: Solve for x
    x = 125,808.22/438.31
  6. Step 6: Final answer
    x = 287.03

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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.