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Finding the Fourth Proportional to 313.92, 471.02 and 121.50

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Solution

The fourth proportional to 313.92, 471.02 and 121.50 is: 182.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.92 : 471.02 = 121.50 : x
  2. Step 2: Convert to fraction form
    313.92/471.02 = 121.50/x
  3. Step 3: Cross multiply
    313.92x = 471.02 × 121.50
  4. Step 4: Simplify right side
    313.92x = 57,228.93
  5. Step 5: Solve for x
    x = 57,228.93/313.92
  6. Step 6: Final answer
    x = 182.30

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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.