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Finding the Fourth Proportional to 315.55, 473.19 and 161.31

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Solution

The fourth proportional to 315.55, 473.19 and 161.31 is: 241.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.55 : 473.19 = 161.31 : x
  2. Step 2: Convert to fraction form
    315.55/473.19 = 161.31/x
  3. Step 3: Cross multiply
    315.55x = 473.19 × 161.31
  4. Step 4: Simplify right side
    315.55x = 76,330.28
  5. Step 5: Solve for x
    x = 76,330.28/315.55
  6. Step 6: Final answer
    x = 241.90

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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.