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Finding the Fourth Proportional to 438.07, 657.84 and 418.57

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Solution

The fourth proportional to 438.07, 657.84 and 418.57 is: 628.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.07 : 657.84 = 418.57 : x
  2. Step 2: Convert to fraction form
    438.07/657.84 = 418.57/x
  3. Step 3: Cross multiply
    438.07x = 657.84 × 418.57
  4. Step 4: Simplify right side
    438.07x = 275,352.09
  5. Step 5: Solve for x
    x = 275,352.09/438.07
  6. Step 6: Final answer
    x = 628.56

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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.