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Finding the Fourth Proportional to 438.87, 657.14 and 386.97

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Solution

The fourth proportional to 438.87, 657.14 and 386.97 is: 579.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.87 : 657.14 = 386.97 : x
  2. Step 2: Convert to fraction form
    438.87/657.14 = 386.97/x
  3. Step 3: Cross multiply
    438.87x = 657.14 × 386.97
  4. Step 4: Simplify right side
    438.87x = 254,291.53
  5. Step 5: Solve for x
    x = 254,291.53/438.87
  6. Step 6: Final answer
    x = 579.42

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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.