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Finding the Fourth Proportional to 307.55, 461.33 and 85.17

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Solution

The fourth proportional to 307.55, 461.33 and 85.17 is: 127.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.55 : 461.33 = 85.17 : x
  2. Step 2: Convert to fraction form
    307.55/461.33 = 85.17/x
  3. Step 3: Cross multiply
    307.55x = 461.33 × 85.17
  4. Step 4: Simplify right side
    307.55x = 39,290.50
  5. Step 5: Solve for x
    x = 39,290.50/307.55
  6. Step 6: Final answer
    x = 127.75

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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.