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Finding the Fourth Proportional to 685.11, 944.93 and 475.28

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Solution

The fourth proportional to 685.11, 944.93 and 475.28 is: 655.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.11 : 944.93 = 475.28 : x
  2. Step 2: Convert to fraction form
    685.11/944.93 = 475.28/x
  3. Step 3: Cross multiply
    685.11x = 944.93 × 475.28
  4. Step 4: Simplify right side
    685.11x = 449,111.65
  5. Step 5: Solve for x
    x = 449,111.65/685.11
  6. Step 6: Final answer
    x = 655.53

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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.