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Finding the Fourth Proportional to 438.70, 657.64 and 164.58

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Solution

The fourth proportional to 438.70, 657.64 and 164.58 is: 246.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.70 : 657.64 = 164.58 : x
  2. Step 2: Convert to fraction form
    438.70/657.64 = 164.58/x
  3. Step 3: Cross multiply
    438.70x = 657.64 × 164.58
  4. Step 4: Simplify right side
    438.70x = 108,234.39
  5. Step 5: Solve for x
    x = 108,234.39/438.70
  6. Step 6: Final answer
    x = 246.72

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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.