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Finding the Fourth Proportional to 475.59, 656.30 and 309.49

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Solution

The fourth proportional to 475.59, 656.30 and 309.49 is: 427.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.59 : 656.30 = 309.49 : x
  2. Step 2: Convert to fraction form
    475.59/656.30 = 309.49/x
  3. Step 3: Cross multiply
    475.59x = 656.30 × 309.49
  4. Step 4: Simplify right side
    475.59x = 203,117.42
  5. Step 5: Solve for x
    x = 203,117.42/475.59
  6. Step 6: Final answer
    x = 427.09

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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.