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Finding the Fourth Proportional to 871.94, 1,308.09 and 286.99

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Solution

The fourth proportional to 871.94, 1,308.09 and 286.99 is: 430.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.94 : 1,308.09 = 286.99 : x
  2. Step 2: Convert to fraction form
    871.94/1,308.09 = 286.99/x
  3. Step 3: Cross multiply
    871.94x = 1,308.09 × 286.99
  4. Step 4: Simplify right side
    871.94x = 375,408.75
  5. Step 5: Solve for x
    x = 375,408.75/871.94
  6. Step 6: Final answer
    x = 430.54

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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.