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Finding the Fourth Proportional to 835.72, 1,253.34 and 287.90

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Solution

The fourth proportional to 835.72, 1,253.34 and 287.90 is: 431.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.72 : 1,253.34 = 287.90 : x
  2. Step 2: Convert to fraction form
    835.72/1,253.34 = 287.90/x
  3. Step 3: Cross multiply
    835.72x = 1,253.34 × 287.90
  4. Step 4: Simplify right side
    835.72x = 360,836.59
  5. Step 5: Solve for x
    x = 360,836.59/835.72
  6. Step 6: Final answer
    x = 431.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.