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Finding the Fourth Proportional to 927.09, 1,390.68 and 342.09

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Solution

The fourth proportional to 927.09, 1,390.68 and 342.09 is: 513.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.09 : 1,390.68 = 342.09 : x
  2. Step 2: Convert to fraction form
    927.09/1,390.68 = 342.09/x
  3. Step 3: Cross multiply
    927.09x = 1,390.68 × 342.09
  4. Step 4: Simplify right side
    927.09x = 475,737.72
  5. Step 5: Solve for x
    x = 475,737.72/927.09
  6. Step 6: Final answer
    x = 513.15

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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.