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Finding the Fourth Proportional to 325.79, 488.72 and 109.31

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Solution

The fourth proportional to 325.79, 488.72 and 109.31 is: 163.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.79 : 488.72 = 109.31 : x
  2. Step 2: Convert to fraction form
    325.79/488.72 = 109.31/x
  3. Step 3: Cross multiply
    325.79x = 488.72 × 109.31
  4. Step 4: Simplify right side
    325.79x = 53,423.48
  5. Step 5: Solve for x
    x = 53,423.48/325.79
  6. Step 6: Final answer
    x = 163.98

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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.