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Finding the Fourth Proportional to 303.68, 419.28 and 216.20

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Solution

The fourth proportional to 303.68, 419.28 and 216.20 is: 298.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    303.68 : 419.28 = 216.20 : x
  2. Step 2: Convert to fraction form
    303.68/419.28 = 216.20/x
  3. Step 3: Cross multiply
    303.68x = 419.28 × 216.20
  4. Step 4: Simplify right side
    303.68x = 90,648.34
  5. Step 5: Solve for x
    x = 90,648.34/303.68
  6. Step 6: Final answer
    x = 298.50

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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.