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Finding the Fourth Proportional to 727.46, 1,003.75 and 428.72

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Solution

The fourth proportional to 727.46, 1,003.75 and 428.72 is: 591.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.46 : 1,003.75 = 428.72 : x
  2. Step 2: Convert to fraction form
    727.46/1,003.75 = 428.72/x
  3. Step 3: Cross multiply
    727.46x = 1,003.75 × 428.72
  4. Step 4: Simplify right side
    727.46x = 430,329.14
  5. Step 5: Solve for x
    x = 430,329.14/727.46
  6. Step 6: Final answer
    x = 591.55

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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.