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Finding the Fourth Proportional to 635.59, 877.20 and 387.05

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Solution

The fourth proportional to 635.59, 877.20 and 387.05 is: 534.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.59 : 877.20 = 387.05 : x
  2. Step 2: Convert to fraction form
    635.59/877.20 = 387.05/x
  3. Step 3: Cross multiply
    635.59x = 877.20 × 387.05
  4. Step 4: Simplify right side
    635.59x = 339,520.26
  5. Step 5: Solve for x
    x = 339,520.26/635.59
  6. Step 6: Final answer
    x = 534.19

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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.