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Finding the Fourth Proportional to 302.20, 451.27 and 261.72

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Solution

The fourth proportional to 302.20, 451.27 and 261.72 is: 390.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.20 : 451.27 = 261.72 : x
  2. Step 2: Convert to fraction form
    302.20/451.27 = 261.72/x
  3. Step 3: Cross multiply
    302.20x = 451.27 × 261.72
  4. Step 4: Simplify right side
    302.20x = 118,106.38
  5. Step 5: Solve for x
    x = 118,106.38/302.20
  6. Step 6: Final answer
    x = 390.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.