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Finding the Fourth Proportional to 438.31, 657.86 and 391.96

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Solution

The fourth proportional to 438.31, 657.86 and 391.96 is: 588.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.31 : 657.86 = 391.96 : x
  2. Step 2: Convert to fraction form
    438.31/657.86 = 391.96/x
  3. Step 3: Cross multiply
    438.31x = 657.86 × 391.96
  4. Step 4: Simplify right side
    438.31x = 257,854.81
  5. Step 5: Solve for x
    x = 257,854.81/438.31
  6. Step 6: Final answer
    x = 588.29

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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.