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Finding the Fourth Proportional to 438.25, 657.29 and 113.60

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Solution

The fourth proportional to 438.25, 657.29 and 113.60 is: 170.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.25 : 657.29 = 113.60 : x
  2. Step 2: Convert to fraction form
    438.25/657.29 = 113.60/x
  3. Step 3: Cross multiply
    438.25x = 657.29 × 113.60
  4. Step 4: Simplify right side
    438.25x = 74,665.14
  5. Step 5: Solve for x
    x = 74,665.14/438.25
  6. Step 6: Final answer
    x = 170.37

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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.