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Finding the Fourth Proportional to 219.13, 328.47 and 137.79

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Solution

The fourth proportional to 219.13, 328.47 and 137.79 is: 206.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.13 : 328.47 = 137.79 : x
  2. Step 2: Convert to fraction form
    219.13/328.47 = 137.79/x
  3. Step 3: Cross multiply
    219.13x = 328.47 × 137.79
  4. Step 4: Simplify right side
    219.13x = 45,259.88
  5. Step 5: Solve for x
    x = 45,259.88/219.13
  6. Step 6: Final answer
    x = 206.54

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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.