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Finding the Fourth Proportional to 872.76, 1,308.71 and 609.34

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Solution

The fourth proportional to 872.76, 1,308.71 and 609.34 is: 913.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.76 : 1,308.71 = 609.34 : x
  2. Step 2: Convert to fraction form
    872.76/1,308.71 = 609.34/x
  3. Step 3: Cross multiply
    872.76x = 1,308.71 × 609.34
  4. Step 4: Simplify right side
    872.76x = 797,449.35
  5. Step 5: Solve for x
    x = 797,449.35/872.76
  6. Step 6: Final answer
    x = 913.71

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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.