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Finding the Fourth Proportional to 727.58, 1,003.78 and 517.69

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Solution

The fourth proportional to 727.58, 1,003.78 and 517.69 is: 714.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.58 : 1,003.78 = 517.69 : x
  2. Step 2: Convert to fraction form
    727.58/1,003.78 = 517.69/x
  3. Step 3: Cross multiply
    727.58x = 1,003.78 × 517.69
  4. Step 4: Simplify right side
    727.58x = 519,646.87
  5. Step 5: Solve for x
    x = 519,646.87/727.58
  6. Step 6: Final answer
    x = 714.21

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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.