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Finding the Fourth Proportional to 438.08, 656.60 and 163.98

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Solution

The fourth proportional to 438.08, 656.60 and 163.98 is: 245.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.08 : 656.60 = 163.98 : x
  2. Step 2: Convert to fraction form
    438.08/656.60 = 163.98/x
  3. Step 3: Cross multiply
    438.08x = 656.60 × 163.98
  4. Step 4: Simplify right side
    438.08x = 107,669.27
  5. Step 5: Solve for x
    x = 107,669.27/438.08
  6. Step 6: Final answer
    x = 245.78

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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.