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Finding the Fourth Proportional to 219.24, 328.96 and 121.72

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Solution

The fourth proportional to 219.24, 328.96 and 121.72 is: 182.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.24 : 328.96 = 121.72 : x
  2. Step 2: Convert to fraction form
    219.24/328.96 = 121.72/x
  3. Step 3: Cross multiply
    219.24x = 328.96 × 121.72
  4. Step 4: Simplify right side
    219.24x = 40,041.01
  5. Step 5: Solve for x
    x = 40,041.01/219.24
  6. Step 6: Final answer
    x = 182.64

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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.