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Finding the Fourth Proportional to 927.09, 1,390.17 and 310.59

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Solution

The fourth proportional to 927.09, 1,390.17 and 310.59 is: 465.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.09 : 1,390.17 = 310.59 : x
  2. Step 2: Convert to fraction form
    927.09/1,390.17 = 310.59/x
  3. Step 3: Cross multiply
    927.09x = 1,390.17 × 310.59
  4. Step 4: Simplify right side
    927.09x = 431,772.90
  5. Step 5: Solve for x
    x = 431,772.90/927.09
  6. Step 6: Final answer
    x = 465.73

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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.