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Finding the Fourth Proportional to 475.80, 655.91 and 309.95

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Solution

The fourth proportional to 475.80, 655.91 and 309.95 is: 427.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.80 : 655.91 = 309.95 : x
  2. Step 2: Convert to fraction form
    475.80/655.91 = 309.95/x
  3. Step 3: Cross multiply
    475.80x = 655.91 × 309.95
  4. Step 4: Simplify right side
    475.80x = 203,299.30
  5. Step 5: Solve for x
    x = 203,299.30/475.80
  6. Step 6: Final answer
    x = 427.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.