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Finding the Fourth Proportional to 485.75, 731.51 and 404.25

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Solution

The fourth proportional to 485.75, 731.51 and 404.25 is: 608.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.75 : 731.51 = 404.25 : x
  2. Step 2: Convert to fraction form
    485.75/731.51 = 404.25/x
  3. Step 3: Cross multiply
    485.75x = 731.51 × 404.25
  4. Step 4: Simplify right side
    485.75x = 295,713.68
  5. Step 5: Solve for x
    x = 295,713.68/485.75
  6. Step 6: Final answer
    x = 608.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.