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Finding the Fourth Proportional to 219.71, 303.16 and 121.45

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Solution

The fourth proportional to 219.71, 303.16 and 121.45 is: 167.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.71 : 303.16 = 121.45 : x
  2. Step 2: Convert to fraction form
    219.71/303.16 = 121.45/x
  3. Step 3: Cross multiply
    219.71x = 303.16 × 121.45
  4. Step 4: Simplify right side
    219.71x = 36,818.52
  5. Step 5: Solve for x
    x = 36,818.52/219.71
  6. Step 6: Final answer
    x = 167.58

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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.