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Finding the Fourth Proportional to 727.20, 1,089.72 and 418.59

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Solution

The fourth proportional to 727.20, 1,089.72 and 418.59 is: 627.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.20 : 1,089.72 = 418.59 : x
  2. Step 2: Convert to fraction form
    727.20/1,089.72 = 418.59/x
  3. Step 3: Cross multiply
    727.20x = 1,089.72 × 418.59
  4. Step 4: Simplify right side
    727.20x = 456,145.89
  5. Step 5: Solve for x
    x = 456,145.89/727.20
  6. Step 6: Final answer
    x = 627.26

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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.