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Finding the Fourth Proportional to 220.68, 302.40 and 219.24

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Solution

The fourth proportional to 220.68, 302.40 and 219.24 is: 300.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.68 : 302.40 = 219.24 : x
  2. Step 2: Convert to fraction form
    220.68/302.40 = 219.24/x
  3. Step 3: Cross multiply
    220.68x = 302.40 × 219.24
  4. Step 4: Simplify right side
    220.68x = 66,298.18
  5. Step 5: Solve for x
    x = 66,298.18/220.68
  6. Step 6: Final answer
    x = 300.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.