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Finding the Fourth Proportional to 847.32, 1,270.97 and 642.27

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Solution

The fourth proportional to 847.32, 1,270.97 and 642.27 is: 963.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.32 : 1,270.97 = 642.27 : x
  2. Step 2: Convert to fraction form
    847.32/1,270.97 = 642.27/x
  3. Step 3: Cross multiply
    847.32x = 1,270.97 × 642.27
  4. Step 4: Simplify right side
    847.32x = 816,305.90
  5. Step 5: Solve for x
    x = 816,305.90/847.32
  6. Step 6: Final answer
    x = 963.40

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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.