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Finding the Fourth Proportional to 927.21, 1,391 and 465.21

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Solution

The fourth proportional to 927.21, 1,391 and 465.21 is: 697.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.21 : 1,391 = 465.21 : x
  2. Step 2: Convert to fraction form
    927.21/1,391 = 465.21/x
  3. Step 3: Cross multiply
    927.21x = 1,391 × 465.21
  4. Step 4: Simplify right side
    927.21x = 647,107.11
  5. Step 5: Solve for x
    x = 647,107.11/927.21
  6. Step 6: Final answer
    x = 697.91

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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.