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Finding the Fourth Proportional to 307.70, 461.10 and 261.80

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Solution

The fourth proportional to 307.70, 461.10 and 261.80 is: 392.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.70 : 461.10 = 261.80 : x
  2. Step 2: Convert to fraction form
    307.70/461.10 = 261.80/x
  3. Step 3: Cross multiply
    307.70x = 461.10 × 261.80
  4. Step 4: Simplify right side
    307.70x = 120,715.98
  5. Step 5: Solve for x
    x = 120,715.98/307.70
  6. Step 6: Final answer
    x = 392.32

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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.