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Finding the Fourth Proportional to 635.74, 877.08 and 386.89

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Solution

The fourth proportional to 635.74, 877.08 and 386.89 is: 533.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.74 : 877.08 = 386.89 : x
  2. Step 2: Convert to fraction form
    635.74/877.08 = 386.89/x
  3. Step 3: Cross multiply
    635.74x = 877.08 × 386.89
  4. Step 4: Simplify right side
    635.74x = 339,333.48
  5. Step 5: Solve for x
    x = 339,333.48/635.74
  6. Step 6: Final answer
    x = 533.76

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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.