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Finding the Fourth Proportional to 635.50, 876.81 and 386.70

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Solution

The fourth proportional to 635.50, 876.81 and 386.70 is: 533.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.50 : 876.81 = 386.70 : x
  2. Step 2: Convert to fraction form
    635.50/876.81 = 386.70/x
  3. Step 3: Cross multiply
    635.50x = 876.81 × 386.70
  4. Step 4: Simplify right side
    635.50x = 339,062.43
  5. Step 5: Solve for x
    x = 339,062.43/635.50
  6. Step 6: Final answer
    x = 533.54

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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.