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Finding the Fourth Proportional to 635.76, 877.20 and 387.03

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Solution

The fourth proportional to 635.76, 877.20 and 387.03 is: 534.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.76 : 877.20 = 387.03 : x
  2. Step 2: Convert to fraction form
    635.76/877.20 = 387.03/x
  3. Step 3: Cross multiply
    635.76x = 877.20 × 387.03
  4. Step 4: Simplify right side
    635.76x = 339,502.72
  5. Step 5: Solve for x
    x = 339,502.72/635.76
  6. Step 6: Final answer
    x = 534.01

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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.