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Finding the Fourth Proportional to 474.95, 655.42 and 309.49

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Solution

The fourth proportional to 474.95, 655.42 and 309.49 is: 427.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.95 : 655.42 = 309.49 : x
  2. Step 2: Convert to fraction form
    474.95/655.42 = 309.49/x
  3. Step 3: Cross multiply
    474.95x = 655.42 × 309.49
  4. Step 4: Simplify right side
    474.95x = 202,844.39
  5. Step 5: Solve for x
    x = 202,844.39/474.95
  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.