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Finding the Fourth Proportional to 635.40, 876.72 and 386.88

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Solution

The fourth proportional to 635.40, 876.72 and 386.88 is: 533.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.40 : 876.72 = 386.88 : x
  2. Step 2: Convert to fraction form
    635.40/876.72 = 386.88/x
  3. Step 3: Cross multiply
    635.40x = 876.72 × 386.88
  4. Step 4: Simplify right side
    635.40x = 339,185.43
  5. Step 5: Solve for x
    x = 339,185.43/635.40
  6. Step 6: Final answer
    x = 533.81

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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.