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Finding the Fourth Proportional to 302.31, 417.21 and 219.69

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Solution

The fourth proportional to 302.31, 417.21 and 219.69 is: 303.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.31 : 417.21 = 219.69 : x
  2. Step 2: Convert to fraction form
    302.31/417.21 = 219.69/x
  3. Step 3: Cross multiply
    302.31x = 417.21 × 219.69
  4. Step 4: Simplify right side
    302.31x = 91,656.86
  5. Step 5: Solve for x
    x = 91,656.86/302.31
  6. Step 6: Final answer
    x = 303.19

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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.