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Finding the Fourth Proportional to 438.69, 657.89 and 207.69

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Solution

The fourth proportional to 438.69, 657.89 and 207.69 is: 311.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.69 : 657.89 = 207.69 : x
  2. Step 2: Convert to fraction form
    438.69/657.89 = 207.69/x
  3. Step 3: Cross multiply
    438.69x = 657.89 × 207.69
  4. Step 4: Simplify right side
    438.69x = 136,638.15
  5. Step 5: Solve for x
    x = 136,638.15/438.69
  6. Step 6: Final answer
    x = 311.47

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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.