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Finding the Fourth Proportional to 438.76, 657.69 and 164.80

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Solution

The fourth proportional to 438.76, 657.69 and 164.80 is: 247.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.76 : 657.69 = 164.80 : x
  2. Step 2: Convert to fraction form
    438.76/657.69 = 164.80/x
  3. Step 3: Cross multiply
    438.76x = 657.69 × 164.80
  4. Step 4: Simplify right side
    438.76x = 108,387.31
  5. Step 5: Solve for x
    x = 108,387.31/438.76
  6. Step 6: Final answer
    x = 247.03

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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.