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Finding the Fourth Proportional to 727.21, 1,003.48 and 412.53

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Solution

The fourth proportional to 727.21, 1,003.48 and 412.53 is: 569.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.21 : 1,003.48 = 412.53 : x
  2. Step 2: Convert to fraction form
    727.21/1,003.48 = 412.53/x
  3. Step 3: Cross multiply
    727.21x = 1,003.48 × 412.53
  4. Step 4: Simplify right side
    727.21x = 413,965.60
  5. Step 5: Solve for x
    x = 413,965.60/727.21
  6. Step 6: Final answer
    x = 569.25

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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.