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Finding the Fourth Proportional to 475.31, 655.44 and 309.53

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Solution

The fourth proportional to 475.31, 655.44 and 309.53 is: 426.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.31 : 655.44 = 309.53 : x
  2. Step 2: Convert to fraction form
    475.31/655.44 = 309.53/x
  3. Step 3: Cross multiply
    475.31x = 655.44 × 309.53
  4. Step 4: Simplify right side
    475.31x = 202,875.07
  5. Step 5: Solve for x
    x = 202,875.07/475.31
  6. Step 6: Final answer
    x = 426.83

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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.