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Finding the Fourth Proportional to 727.75, 1,090.71 and 316.48

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Solution

The fourth proportional to 727.75, 1,090.71 and 316.48 is: 474.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.75 : 1,090.71 = 316.48 : x
  2. Step 2: Convert to fraction form
    727.75/1,090.71 = 316.48/x
  3. Step 3: Cross multiply
    727.75x = 1,090.71 × 316.48
  4. Step 4: Simplify right side
    727.75x = 345,187.90
  5. Step 5: Solve for x
    x = 345,187.90/727.75
  6. Step 6: Final answer
    x = 474.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.