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Finding the Fourth Proportional to 727.16, 1,089.83 and 380.31

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Solution

The fourth proportional to 727.16, 1,089.83 and 380.31 is: 569.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.16 : 1,089.83 = 380.31 : x
  2. Step 2: Convert to fraction form
    727.16/1,089.83 = 380.31/x
  3. Step 3: Cross multiply
    727.16x = 1,089.83 × 380.31
  4. Step 4: Simplify right side
    727.16x = 414,471.35
  5. Step 5: Solve for x
    x = 414,471.35/727.16
  6. Step 6: Final answer
    x = 569.99

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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.