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Finding the Fourth Proportional to 219.77, 303.28 and 121.53

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Solution

The fourth proportional to 219.77, 303.28 and 121.53 is: 167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.77 : 303.28 = 121.53 : x
  2. Step 2: Convert to fraction form
    219.77/303.28 = 121.53/x
  3. Step 3: Cross multiply
    219.77x = 303.28 × 121.53
  4. Step 4: Simplify right side
    219.77x = 36,856.10
  5. Step 5: Solve for x
    x = 36,856.10/219.77
  6. Step 6: Final answer
    x = 167.70

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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.