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Finding the Fourth Proportional to 318, 438.56 and 207.37

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Solution

The fourth proportional to 318, 438.56 and 207.37 is: 285.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 438.56 = 207.37 : x
  2. Step 2: Convert to fraction form
    318/438.56 = 207.37/x
  3. Step 3: Cross multiply
    318x = 438.56 × 207.37
  4. Step 4: Simplify right side
    318x = 90,944.19
  5. Step 5: Solve for x
    x = 90,944.19/318
  6. Step 6: Final answer
    x = 285.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.