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Finding the Fourth Proportional to 927.88, 1,392.36 and 517.28

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Solution

The fourth proportional to 927.88, 1,392.36 and 517.28 is: 776.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.88 : 1,392.36 = 517.28 : x
  2. Step 2: Convert to fraction form
    927.88/1,392.36 = 517.28/x
  3. Step 3: Cross multiply
    927.88x = 1,392.36 × 517.28
  4. Step 4: Simplify right side
    927.88x = 720,239.98
  5. Step 5: Solve for x
    x = 720,239.98/927.88
  6. Step 6: Final answer
    x = 776.22

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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.