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Finding the Fourth Proportional to 461.78, 692.80 and 137.15

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Solution

The fourth proportional to 461.78, 692.80 and 137.15 is: 205.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.78 : 692.80 = 137.15 : x
  2. Step 2: Convert to fraction form
    461.78/692.80 = 137.15/x
  3. Step 3: Cross multiply
    461.78x = 692.80 × 137.15
  4. Step 4: Simplify right side
    461.78x = 95,016.31
  5. Step 5: Solve for x
    x = 95,016.31/461.78
  6. Step 6: Final answer
    x = 205.76

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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.