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Finding the Fourth Proportional to 474.56, 655.04 and 319.31

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Solution

The fourth proportional to 474.56, 655.04 and 319.31 is: 440.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.56 : 655.04 = 319.31 : x
  2. Step 2: Convert to fraction form
    474.56/655.04 = 319.31/x
  3. Step 3: Cross multiply
    474.56x = 655.04 × 319.31
  4. Step 4: Simplify right side
    474.56x = 209,160.82
  5. Step 5: Solve for x
    x = 209,160.82/474.56
  6. Step 6: Final answer
    x = 440.75

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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.