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Finding the Fourth Proportional to 727.12, 1,089.72 and 341.68

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Solution

The fourth proportional to 727.12, 1,089.72 and 341.68 is: 512.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.12 : 1,089.72 = 341.68 : x
  2. Step 2: Convert to fraction form
    727.12/1,089.72 = 341.68/x
  3. Step 3: Cross multiply
    727.12x = 1,089.72 × 341.68
  4. Step 4: Simplify right side
    727.12x = 372,335.53
  5. Step 5: Solve for x
    x = 372,335.53/727.12
  6. Step 6: Final answer
    x = 512.07

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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.