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Finding the Fourth Proportional to 727.22, 1,003.38 and 428.42

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Solution

The fourth proportional to 727.22, 1,003.38 and 428.42 is: 591.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.22 : 1,003.38 = 428.42 : x
  2. Step 2: Convert to fraction form
    727.22/1,003.38 = 428.42/x
  3. Step 3: Cross multiply
    727.22x = 1,003.38 × 428.42
  4. Step 4: Simplify right side
    727.22x = 429,868.06
  5. Step 5: Solve for x
    x = 429,868.06/727.22
  6. Step 6: Final answer
    x = 591.11

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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.