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Finding the Fourth Proportional to 727.90, 1,091.57 and 317.09

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Solution

The fourth proportional to 727.90, 1,091.57 and 317.09 is: 475.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.90 : 1,091.57 = 317.09 : x
  2. Step 2: Convert to fraction form
    727.90/1,091.57 = 317.09/x
  3. Step 3: Cross multiply
    727.90x = 1,091.57 × 317.09
  4. Step 4: Simplify right side
    727.90x = 346,125.93
  5. Step 5: Solve for x
    x = 346,125.93/727.90
  6. Step 6: Final answer
    x = 475.51

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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.