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Finding the Fourth Proportional to 927.45, 1,387.94 and 639.09

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Solution

The fourth proportional to 927.45, 1,387.94 and 639.09 is: 956.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.45 : 1,387.94 = 639.09 : x
  2. Step 2: Convert to fraction form
    927.45/1,387.94 = 639.09/x
  3. Step 3: Cross multiply
    927.45x = 1,387.94 × 639.09
  4. Step 4: Simplify right side
    927.45x = 887,015.38
  5. Step 5: Solve for x
    x = 887,015.38/927.45
  6. Step 6: Final answer
    x = 956.40

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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.