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Finding the Fourth Proportional to 727.47, 1,003.87 and 395.90

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Solution

The fourth proportional to 727.47, 1,003.87 and 395.90 is: 546.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.47 : 1,003.87 = 395.90 : x
  2. Step 2: Convert to fraction form
    727.47/1,003.87 = 395.90/x
  3. Step 3: Cross multiply
    727.47x = 1,003.87 × 395.90
  4. Step 4: Simplify right side
    727.47x = 397,427.87
  5. Step 5: Solve for x
    x = 397,427.87/727.47
  6. Step 6: Final answer
    x = 546.32

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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.