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Finding the Fourth Proportional to 302.20, 453.30 and 261.70

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Solution

The fourth proportional to 302.20, 453.30 and 261.70 is: 392.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.20 : 453.30 = 261.70 : x
  2. Step 2: Convert to fraction form
    302.20/453.30 = 261.70/x
  3. Step 3: Cross multiply
    302.20x = 453.30 × 261.70
  4. Step 4: Simplify right side
    302.20x = 118,628.61
  5. Step 5: Solve for x
    x = 118,628.61/302.20
  6. Step 6: Final answer
    x = 392.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.