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Finding the Fourth Proportional to 639.94, 959.10 and 553.27

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Solution

The fourth proportional to 639.94, 959.10 and 553.27 is: 829.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.94 : 959.10 = 553.27 : x
  2. Step 2: Convert to fraction form
    639.94/959.10 = 553.27/x
  3. Step 3: Cross multiply
    639.94x = 959.10 × 553.27
  4. Step 4: Simplify right side
    639.94x = 530,641.26
  5. Step 5: Solve for x
    x = 530,641.26/639.94
  6. Step 6: Final answer
    x = 829.20

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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.