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Finding the Fourth Proportional to 727.38, 1,089.86 and 315.90

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Solution

The fourth proportional to 727.38, 1,089.86 and 315.90 is: 473.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.38 : 1,089.86 = 315.90 : x
  2. Step 2: Convert to fraction form
    727.38/1,089.86 = 315.90/x
  3. Step 3: Cross multiply
    727.38x = 1,089.86 × 315.90
  4. Step 4: Simplify right side
    727.38x = 344,285.19
  5. Step 5: Solve for x
    x = 344,285.19/727.38
  6. Step 6: Final answer
    x = 473.32

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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.