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Finding the Fourth Proportional to 219.71, 303.21 and 126.45

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Solution

The fourth proportional to 219.71, 303.21 and 126.45 is: 174.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.71 : 303.21 = 126.45 : x
  2. Step 2: Convert to fraction form
    219.71/303.21 = 126.45/x
  3. Step 3: Cross multiply
    219.71x = 303.21 × 126.45
  4. Step 4: Simplify right side
    219.71x = 38,340.90
  5. Step 5: Solve for x
    x = 38,340.90/219.71
  6. Step 6: Final answer
    x = 174.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.