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Finding the Fourth Proportional to 835.11, 1,152.63 and 639.09

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Solution

The fourth proportional to 835.11, 1,152.63 and 639.09 is: 882.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.11 : 1,152.63 = 639.09 : x
  2. Step 2: Convert to fraction form
    835.11/1,152.63 = 639.09/x
  3. Step 3: Cross multiply
    835.11x = 1,152.63 × 639.09
  4. Step 4: Simplify right side
    835.11x = 736,634.31
  5. Step 5: Solve for x
    x = 736,634.31/835.11
  6. Step 6: Final answer
    x = 882.08

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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.