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Finding the Fourth Proportional to 636.64, 877.87 and 553.03

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Solution

The fourth proportional to 636.64, 877.87 and 553.03 is: 762.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.64 : 877.87 = 553.03 : x
  2. Step 2: Convert to fraction form
    636.64/877.87 = 553.03/x
  3. Step 3: Cross multiply
    636.64x = 877.87 × 553.03
  4. Step 4: Simplify right side
    636.64x = 485,488.45
  5. Step 5: Solve for x
    x = 485,488.45/636.64
  6. Step 6: Final answer
    x = 762.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.