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Finding the Fourth Proportional to 727.90, 1,004.47 and 396.31

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Solution

The fourth proportional to 727.90, 1,004.47 and 396.31 is: 546.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.90 : 1,004.47 = 396.31 : x
  2. Step 2: Convert to fraction form
    727.90/1,004.47 = 396.31/x
  3. Step 3: Cross multiply
    727.90x = 1,004.47 × 396.31
  4. Step 4: Simplify right side
    727.90x = 398,079.89
  5. Step 5: Solve for x
    x = 398,079.89/727.90
  6. Step 6: Final answer
    x = 546.89

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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.