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Finding the Fourth Proportional to 438.54, 657.92 and 130.39

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Solution

The fourth proportional to 438.54, 657.92 and 130.39 is: 195.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.54 : 657.92 = 130.39 : x
  2. Step 2: Convert to fraction form
    438.54/657.92 = 130.39/x
  3. Step 3: Cross multiply
    438.54x = 657.92 × 130.39
  4. Step 4: Simplify right side
    438.54x = 85,786.51
  5. Step 5: Solve for x
    x = 85,786.51/438.54
  6. Step 6: Final answer
    x = 195.62

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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.