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Finding the Fourth Proportional to 438.63, 657.67 and 207.57

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Solution

The fourth proportional to 438.63, 657.67 and 207.57 is: 311.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.63 : 657.67 = 207.57 : x
  2. Step 2: Convert to fraction form
    438.63/657.67 = 207.57/x
  3. Step 3: Cross multiply
    438.63x = 657.67 × 207.57
  4. Step 4: Simplify right side
    438.63x = 136,512.56
  5. Step 5: Solve for x
    x = 136,512.56/438.63
  6. Step 6: Final answer
    x = 311.22

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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.